Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 30,228		$ 209,327		$ 52,981		$ 222,799
Other comprehensive (loss) income, net of tax
Unrealized (loss) gain on hedging activities, net of tax (1)	(502)	[1]	(81)	[1]	(529)	[1]	346	[1]
Foreign currency translation adjustments, net of tax (2)	(4,612)	[2]	2,976	[2]	(10,560)	[2]	(11,529)	[2]
Defined benefit pension and other postretirement benefits, net of tax (3)	1,489	[3]	15,529	[3]	(4,381)	[3]	17,939	[3]
Total other comprehensive (loss) income, net of tax	(3,625)		18,424		(15,470)		6,756
Total comprehensive income	26,603		227,751		37,511		229,555
Unrealized (loss) income on hedging activities, tax	(208)		249		(194)		437
Foreign currency translation adjustment, tax	(569)		(410)		(767)		(511)
Defined benefit pension and other postretirement benefits, tax	$ 797		$ 8,534		$ (2,990)		$ 11,372

[1] Net of tax of $(208) and $249 for the three months ended June 30, 2014 and 2013, respectively, and $(194) and $437 for the six months ended June 30, 2014 and 2013, respectively.

[2] Net of tax of $(569) and $(410) for the three months ended June 30, 2014 and 2013, respectively, and $(767) and $(511) for the six months ended June 30, 2014 and 2013, respectively.

[3] Net of tax of $797 and $8,534 for the three months ended June 30, 2014 and 2013, respectively, and $(2,990) and $11,372 for the six months ended June 30, 2014 and 2013, respectively.