Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Changes in Shareholders Equity        
Total shareholders' equity as of December 31, 2011     $ 560,188  
Net income 133,368 111,180 241,530 199,199
Issuance of common shares from exercise of stock options, SARs, restricted stock grants, warrants, and employee stock purchase plan     10,356 8,280
Excess tax benefit from exercise of stock options, SARs and restricted stock grants     27,212 19,544
Additional capital from share-based compensation     12,497 11,103
Repurchases of common shares     (505,636) (115,287)
Dividends and dividend equivalents (35,100) (23,900) (70,310) (38,689)
Foreign currency translation adjustment, net of income taxes (15,143) 5,256 (3,924) 20,198
Unrealized loss on derivatives, net of income taxes 528 (98) (1,194) 171
Total shareholders' equity as of June 30, 2012 $ 270,719   $ 270,719