Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 34,221	$ 29,191
Other comprehensive income:
Foreign currency translation adjustments	2,676	852
Unrealized gain on interest rate swap hedge	53	1,384
Amortization of pension unrealized actuarial gain	(54)	(33)
Other Comprehensive Income (Loss), before Tax, Total	2,675	2,203
Tax effect of comprehensive income items	(21)	(553)
Other comprehensive income, net of tax effect	2,654	1,650
Comprehensive income	$ 36,875	$ 30,841