Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Changes in net prior service credit and actuarial losses, tax provision (benefit)	$ 42,822	$ (3,337)	$ (16,045)
Change in fair value of derivatives, tax provision (benefit)	2,763	(513)	(65)
Foreign currency translation, tax provision (benefit)	$ 4,580	$ 3,309	$ (6,469)