Annual report pursuant to Section 13 and 15(d)

Basis of Presentation (Details)

v2.4.0.6
Basis of Presentation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Consolidated Balance Sheet                        
Paid-in-capital in excess of par value $ 291,950       $ 248,693       $ 291,950 $ 248,693    
Retained earnings 305,931       265,686       305,931 265,686    
Consolidated Statements of Income                        
Income Taxes                 147,201 80,880 87,582  
Net Income 105,400 108,000 111,200 88,000 86,300 78,900 82,200 51,800 412,578 299,215 203,346  
Basic earnings per share $ 0.91 $ 0.92 $ 0.93 $ 0.74 $ 0.73 $ 0.67 $ 0.69 $ 0.43 $ 3.51 $ 2.51 $ 1.66  
Diluted earnings per share $ 0.86 $ 0.87 $ 0.88 $ 0.70 $ 0.69 $ 0.63 $ 0.65 $ 0.41 $ 3.30 $ 2.37 $ 1.61  
Common Share Amounts Used to Compute Basic and Diluted Earnings Per Share                        
Weighted average shares used in basic computations                 117,540 119,004 122,442  
Dilutive effect of exercise of equity grants outstanding                 7,046 7,059 3,468  
Dilutive effect of warrants                 260 432 284  
Weighted average shares used in diluted computations                 124,846 126,495 126,194  
Changes in Shareholders' Equity and Comprehensive Income                        
Excess tax benefit from exercise of stock options, SARs and restricted stock grants                 27,450 8,045 3,587  
Balance at December 31, 2010 560,188       487,212       560,188 487,212 359,311 241,731
Net Income 105,400 108,000 111,200 88,000 86,300 78,900 82,200 51,800 412,578 299,215 203,346  
Consolidated Statement of Cash Flows                        
Net Income 105,400 108,000 111,200 88,000 86,300 78,900 82,200 51,800 412,578 299,215 203,346  
Excess tax benefits from share-based payment arrangements                 (27,450) (7,728) (3,266)  
Net cash provided by operating activities                 509,331 389,084 285,056  
Excess tax benefits from share-based payment arrangements                 27,450 7,728 3,266  
Net cash used in financing activities                 (337,799) (263,162) (213,327)  
Retained Earnings [Member]
                        
Consolidated Statements of Income                        
Net Income                 412,578 299,215 203,346  
Changes in Shareholders' Equity and Comprehensive Income                        
Balance at December 31, 2010 305,931       265,686       305,931 265,686 159,705 72,507
Net Income                 412,578 299,215 203,346  
Consolidated Statement of Cash Flows                        
Net Income                 412,578 299,215 203,346  
Comprehensive Income [Member]
                        
Consolidated Statements of Income                        
Net Income                 412,578 299,215 203,346  
Changes in Shareholders' Equity and Comprehensive Income                        
Net Income                 412,578 299,215 203,346  
Total comprehensive income                 402,054 295,326 208,564  
Consolidated Statement of Cash Flows                        
Net Income                 412,578 299,215 203,346  
As Reported [Member]
                        
Consolidated Balance Sheet                        
Paid-in-capital in excess of par value         257,375         257,375    
Retained earnings         257,004         257,004    
Consolidated Statements of Income                        
Income Taxes                   89,562    
Net Income       87,600 81,000         290,533    
Basic earnings per share       $ 0.74 $ 0.69         $ 2.44    
Diluted earnings per share       $ 0.71 $ 0.65         $ 2.33    
Common Share Amounts Used to Compute Basic and Diluted Earnings Per Share                        
Weighted average shares used in basic computations                   119,004    
Dilutive effect of exercise of equity grants outstanding                   5,076    
Dilutive effect of warrants                   432    
Weighted average shares used in diluted computations                   124,512    
Changes in Shareholders' Equity and Comprehensive Income                        
Excess tax benefit from exercise of stock options, SARs and restricted stock grants                   16,727    
Balance at December 31, 2010         257,375         257,375    
Net Income       87,600 81,000         290,533    
Consolidated Statement of Cash Flows                        
Net Income       87,600 81,000         290,533    
Excess tax benefits from share-based payment arrangements                   (16,410)    
Deferred Income Taxes                   (24,631)    
Net cash provided by operating activities                   380,402    
Excess tax benefits from share-based payment arrangements                   16,410    
Net cash used in financing activities                   (254,480)    
As Reported [Member] | Retained Earnings [Member]
                        
Consolidated Statements of Income                        
Net Income                   290,533    
Changes in Shareholders' Equity and Comprehensive Income                        
Balance at December 31, 2010         257,004         257,004    
Net Income                   290,533    
Consolidated Statement of Cash Flows                        
Net Income                   290,533    
As Reported [Member] | Comprehensive Income [Member]
                        
Consolidated Statements of Income                        
Net Income                   290,533    
Changes in Shareholders' Equity and Comprehensive Income                        
Net Income                   290,533    
Total comprehensive income                   286,644    
Consolidated Statement of Cash Flows                        
Net Income                   290,533    
As Adjusted [Member]
                        
Consolidated Balance Sheet                        
Paid-in-capital in excess of par value         248,693         248,693    
Retained earnings         265,686         265,686    
Consolidated Statements of Income                        
Income Taxes                   80,880    
Net Income                   299,215    
Basic earnings per share                   $ 2.51    
Diluted earnings per share                   $ 2.37    
Common Share Amounts Used to Compute Basic and Diluted Earnings Per Share                        
Weighted average shares used in basic computations                   119,004    
Dilutive effect of exercise of equity grants outstanding                   7,059    
Dilutive effect of warrants                   432    
Weighted average shares used in diluted computations                   126,495    
Changes in Shareholders' Equity and Comprehensive Income                        
Excess tax benefit from exercise of stock options, SARs and restricted stock grants                   8,045    
Balance at December 31, 2010         248,693         248,693    
Net Income                   299,215    
Consolidated Statement of Cash Flows                        
Net Income                   299,215    
Excess tax benefits from share-based payment arrangements                   (7,728)    
Deferred Income Taxes                   (33,313)    
Net cash provided by operating activities                   389,084    
Excess tax benefits from share-based payment arrangements                   7,728    
Net cash used in financing activities                   (263,162)    
As Adjusted [Member] | Retained Earnings [Member]
                        
Consolidated Statements of Income                        
Net Income                   299,215    
Changes in Shareholders' Equity and Comprehensive Income                        
Balance at December 31, 2010         265,686         265,686    
Net Income                   299,215    
Consolidated Statement of Cash Flows                        
Net Income                   299,215    
As Adjusted [Member] | Comprehensive Income [Member]
                        
Consolidated Statements of Income                        
Net Income                   299,215    
Changes in Shareholders' Equity and Comprehensive Income                        
Net Income                   299,215    
Total comprehensive income                   295,326    
Consolidated Statement of Cash Flows                        
Net Income                   299,215    
As Computed Under Prior Method [Member]
                        
Consolidated Statements of Income                        
Income Taxes                 159,083      
Net Income                 400,696      
Basic earnings per share                 $ 3.41      
Diluted earnings per share                 $ 3.25      
Changes in Shareholders' Equity and Comprehensive Income                        
Net Income                 400,696      
Consolidated Statement of Cash Flows                        
Net Income                 $ 400,696