CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 74,548	$ 61,300
Other comprehensive income (loss)
Reclassification adjustments for derivatives, net of tax	1,157	1,190
Pension and other postretirement adjustments, net of tax	439	1,273
Cumulative translation adjustment	284	(27,253)
Other comprehensive income (loss)	1,880	(24,790)
Comprehensive income	$ 76,428	$ 36,510