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Comprehensive Income (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Comprehensive Income [Abstract]    
Net income$ 24,169$ 22,784$ 82,108$ 69,443
Foreign currency translation adjustments(1,233)(1,283)608(2,921)
Unrealized gains on interest rate swaps502[1]172[1]1,363[1]499[1]
Comprehensive income$ 23,438$ 21,673$ 84,079$ 67,021
[1]Amounts are shown net of tax.