CONDENSED 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	$ 71,777	$ 62,561	$ 146,325	$ 123,861
Other comprehensive income (loss)
Reclassification adjustments for derivatives, net of tax	1,155	1,187	2,312	2,377
Pension and other postretirement adjustments, net of tax	517	938	956	2,211
Cumulative translation adjustment	13,874	4,144	14,158	(23,109)
Other comprehensive income (loss)	15,546	6,269	17,426	(18,521)
Comprehensive income	$ 87,323	$ 68,830	$ 163,751	$ 105,340