Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 41,512,000	$ 44,377,000	$ 85,269,000	$ 96,236,000
Other comprehensive income (loss), net of tax:
Amortization of loss on cash flow hedge	215,000	215,000	646,000	646,000
Foreign currency translation adjustment	512,000	211,000	(1,800,000)	191,000
Actuarial loss (net of income tax of $12 and $36 for the three and nine months ended September 30, 2012, respectively)	0	20,000	0	60,000
Other comprehensive income (loss), net of tax	727,000	446,000	(1,154,000)	897,000
Comprehensive income	$ 42,239,000	$ 44,823,000	$ 84,115,000	$ 97,133,000