CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 69,873	$ 79,505	$ 213,762	$ 215,044
Other comprehensive income (loss)
Reclassification adjustments for derivatives, net of tax	1,082	1,114	3,272	3,370
Pension and other postretirement adjustments, net of tax	594	818	1,856	2,418
Cumulative translation adjustment	353	(16,936)	(10,473)	(49,830)
Reclassification of foreign currency translation to earnings upon sale of subsidiaries	4,258	(4,725)	4,258	(4,725)
Other comprehensive income (loss)	6,287	(19,729)	(1,087)	(48,767)
Comprehensive income	$ 76,160	$ 59,776	$ 212,675	$ 166,277