Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, income tax benefit	$ 0	$ 732	$ 0	$ 1,074
Cash flow hedges, income tax benefit (expense)	631	1,133	1,064	1,501
Amortization of pension and postretirement plans, income tax expense	$ 0	$ 179	$ 0	$ 337