Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Details)

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Comprehensive Income (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Components of total comprehensive income        
Net income $ 108,022,000 $ 78,884,000 $ 307,221,000 $ 212,930,000
Unrealized (loss) gain on derivative instruments, net of taxes 3,600,000 (9,300,000) 3,800,000 (4,700,000)
Foreign currency translation adjustment (32,700,000) 23,800,000 (12,500,000) 3,500,000
Comprehensive income $ 78,900,000 $ 93,400,000 $ 298,500,000 $ 211,700,000