Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 55,075	$ 35,526
Other comprehensive income, before tax:
Foreign currency translation adjustments	22,438	30,044
Net unrealized gains on cash flow hedge	2,069	3,418
Amortization of net prior service costs and net actuarial losses	3,078	2,010
Other comprehensive income, before tax	27,585	35,472
Income tax expense related to items of other comprehensive income	(1,922)	(1,907)
Other comprehensive income, net of tax	25,663	33,565
Comprehensive income	$ 80,738	$ 69,091