Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (3,748)	$ (3,020)	$ (10,638)	$ (8,826)
Net sales	357,156	311,561	1,063,451	906,586
Income before income taxes	43,681	48,176	149,262	131,954
Tax benefit	(8,348)	(11,348)	(30,599)	(33,066)
Total reclassifications in the period	35,333	36,828	118,663	98,888
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications in the period	(2,356)	(1,915)	(5,841)	(5,700)
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	(214)	(157)	(558)	(397)
Tax benefit	74	55	181	154
Income from continuing operations	(140)	(102)	(377)	(243)
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	(174)	(137)	(380)	(437)
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	(40)	(20)	(178)	40
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	(3,162)	(2,790)	(8,213)	(8,387)
Tax benefit	946	977	2,749	2,930
Income from continuing operations	(2,216)	(1,813)	(5,464)	(5,457)
Amortization of prior-service (costs) credits, net	(93)	41	(279)	123
Amortization of actuarial losses	(2,771)	(2,831)	(8,053)	(8,510)
Curtailment gain			187	0
Settlement loss	$ (298)	$ 0	$ (68)	$ 0