Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (3,541)	$ (2,815)	$ (6,890)	$ (5,806)
Net sales	364,493	306,693	706,295	595,025
Income before income taxes	53,205	45,469	105,581	83,778
Tax benefit	(8,178)	(12,257)	(22,251)	(21,718)
Total reclassifications in the period	45,027	33,212	83,330	62,060
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications in the period	(1,608)	(1,941)	(3,411)	(3,785)
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 before income taxes	(272)	(94)	(365)	(240)
Tax benefit	85	43	115	99
Income from continuing operations	(187)	(51)	(250)	(141)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges | Interest Rate Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(164)	(149)	(227)	(300)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges | Foreign Exchange Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales	(108)	55	(138)	60
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 before income taxes	(2,410)	(2,908)	(5,051)	(5,597)
Tax benefit	989	1,018	1,890	1,953
Income from continuing operations	(1,421)	(1,890)	(3,161)	(3,644)
Amortization of prior-service credits, net	(94)	39	(186)	82
Amortization of actuarial losses	(2,733)	(2,947)	(5,282)	(5,679)
Curtailment gain	187	0	187	0
Settlement gain	$ 230	$ 0	$ 230	$ 0