Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 151,346	$ 193,173	$ 144,646
Other comprehensive income (loss), net of tax:
Changes in net prior service credit and actuarial losses, net of tax benefit of $3,337, $16,045 and $654, respectively	(6,466)	(25,602)	(3,809)
Change in fair value of derivatives, net of tax benefit (provision) of $513, $65 and $(882), respectively	(905)	(127)	1,200
Foreign currency translation, net of tax benefit (provision) of $3,309, $(6,469) and $(6,248), respectively	12,740	(26,527)	(4,816)
Other comprehensive income (loss)	5,369	(52,256)	(7,425)
Comprehensive income	$ 156,715	$ 140,917	$ 137,221