Changes in Accumulated Other Comprehensive Income by Component (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (11,883)	$ (10,698)	$ (11,392)
Net sales	1,230,754	1,193,975	1,262,006
Income from continuing operations before income taxes	182,621	157,946	166,500
Tax benefit	(47,020)	(36,566)	(45,959)
Income from continuing operations	135,601	121,380	120,541
Total reclassifications in the period	135,601	121,380	$ 118,370
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications in the period	(7,667)	(17,424)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes	(618)	(1,343)
Tax benefit	221	426
Income from continuing operations	(397)	(917)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges | Interest Rate Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(557)	(853)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges | Foreign Exchange Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	(61)	(490)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and Other Postretirement Benefit Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes	(11,163)	(25,695)
Tax benefit	3,893	9,188
Income from continuing operations	(7,270)	(16,507)
Amortization of prior-service credits, net	163	259
Amortization of actuarial losses	(11,326)	(16,015)
Settlement loss	$ 0	$ (9,939)