Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 270,527		$ 95,249		$ 64,715
Other comprehensive income (loss), net of tax
Unrealized (loss) gain on hedging activities, net of tax (1)	(87)	[1]	(635)	[1]	381	[1]
Unrealized (loss) gain on hedging activities, tax	272		(513)		232
Foreign currency translation adjustments, net of tax (2)	19,615	[2]	24,678	[2]	2,514	[2]
Foreign currency translation adjustment, tax	439		1,262		(296)
Defined benefit pension and other postretirement benefits, net of tax (3)	73,168	[3]	(15,741)	[3]	(41,355)	[3]
Defined benefit pension and other postretirement benefits, tax	43,109		(7,994)		(25,605)
Total other comprehensive income (loss), net of tax	92,696		8,302		(38,460)
Total comprehensive income	$ 363,223		$ 103,551		$ 26,255

[1] Net of tax of $272, $(513) and $232 for the years ended December 31, 2013, 2012 and 2011, respectively.

[2] Net of tax of $439, $1,262 and $(296) for the years ended December 31, 2013, 2012 and 2011, respectively.

[3] Net of tax of $43,109, $(7,994) and $(25,605) for the years ended December 31, 2013, 2012 and 2011, respectively.