CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 79,505	$ 71,441	$ 215,044	$ 217,766
Other comprehensive income (loss)
Reclassification adjustments for derivatives, net of tax	1,114	1,141	3,370	3,453
Pension and other postretirement adjustments, net of tax	818	1,614	2,418	2,570
Cumulative translation adjustment	(16,936)	(55,688)	(49,830)	(41,530)
Reclassification of foreign currency translation to earnings upon sale of subsidiaries	(4,725)	0	(4,725)	0
Other comprehensive income (loss)	(19,729)	(52,933)	(48,767)	(35,507)
Comprehensive income	$ 59,776	$ 18,508	$ 166,277	$ 182,259