Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 31,375	$ 30,464	$ 107,080	$ 91,878
Other comprehensive income (loss):
Foreign currency translation adjustments	5,383	(5,352)	3,720	(3,828)
Unrealized loss on interest rate swap hedge	(470)	(5,283)	(1,139)	(8,170)
Amortization of pension unrealized actuarial gain	(51)	(33)	(157)	(100)
	4,862	(10,668)	2,424	(12,098)
Tax effect of comprehensive income items	188	2,113	456	3,268
Other comprehensive income (loss), net of tax effect	5,050	(8,555)	2,880	(8,830)
Comprehensive income	$ 36,425	$ 21,909	$ 109,960	$ 83,048