Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (5,344)	$ (4,054)	$ (15,856)	$ (12,078)
Net sales	372,587	369,797	1,120,947	1,111,772
Income before income taxes	59,717	52,562	153,293	162,340
Tax benefit	(13,948)	(13,453)	(35,916)	(34,983)
Total reclassifications in the period	45,769	39,109	117,377	127,357
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications in the period	(1,958)	(2,634)	(6,006)	(8,262)
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	(113)	(286)	(421)	(1,233)
Tax benefit	19	62	81	277
Income from continuing operations	(94)	(224)	(340)	(956)
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	86	40	367	(374)
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	(199)	(326)	(788)	(859)
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	(2,418)	(3,160)	(7,329)	(9,577)
Tax benefit	554	750	1,663	2,271
Income from continuing operations	(1,864)	(2,410)	(5,666)	(7,306)
Amortization of prior-service credits, net	(107)	(146)	(321)	(437)
Amortization of actuarial losses	(2,218)	(3,014)	(6,668)	(9,140)
Settlement loss	$ (93)	$ 0	$ (340)	$ 0