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	$ 38,716,000	$ 42,744,000	$ 90,266,000	$ 100,909,000
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	524,000	211,000	(1,803,000)	191,000
Amortization of pension related costs, net of tax:
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	739,000	446,000	(1,157,000)	897,000
Comprehensive income	$ 39,455,000	$ 43,190,000	$ 89,109,000	$ 101,806,000