Consolidated Statements of Income and Comprehensive Income (Parenthetical) - 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]
Foreign currency translation adjustment, income tax benefit	$ 0	$ 429	$ 0	$ 1,581
Cash flow hedges, income tax benefit (expense)	229	185	1,293	1,687
Amortization of pension and postretirement plans, income tax expense	$ 0	$ 66	$ 0	$ 404