CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 83,768	$ 69,873	$ 243,511	$ 213,762
Other comprehensive income (loss)
Reclassification adjustments for derivatives, net of tax	1,054	1,082	3,159	3,272
Pension and other postretirement adjustments, net of tax	1,468	594	3,872	1,856
Cumulative translation adjustment	28,796	353	97,160	(10,473)
Reclassification of foreign currency translation to earnings upon sale of subsidiaries	0	4,258	0	4,258
Other comprehensive income (loss)	31,318	6,287	104,191	(1,087)
Comprehensive income	$ 115,086	$ 76,160	$ 347,702	$ 212,675