Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Details)

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Comprehensive Income (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Components of total comprehensive income        
Net income $ 111,180,000 $ 82,175,000 $ 199,199,000 $ 134,046,000
Unrealized gain on derivative instruments, net of tax (100,000) 2,500,000 200,000 4,600,000
Foreign currency translation adjustment 5,300,000 (15,100,000) 20,200,000 (20,300,000)
Comprehensive income $ 116,400,000 $ 69,600,000 $ 219,600,000 $ 118,300,000