Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (5,399)	$ (4,133)	$ (10,512)	$ (8,025)
Net sales	371,669	375,315	748,360	741,975
Income before income taxes	49,846	58,799	93,576	109,777
Tax benefit	(12,230)	(9,370)	(21,968)	(21,530)
Total reclassifications in the period	37,616	49,429	71,608	88,247
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications in the period	(2,156)	(2,986)	(4,047)	(5,628)
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)	(638)	(308)	(947)
Tax benefit	22	146	63	215
Income from continuing operations	(91)	(492)	(245)	(732)
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	139	(332)	281	(414)
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	(252)	(306)	(589)	(533)
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	(2,634)	(3,300)	(4,911)	(6,417)
Tax benefit	569	806	1,109	1,521
Income from continuing operations	(2,065)	(2,494)	(3,802)	(4,896)
Amortization of prior-service credits, net	(105)	(145)	(214)	(291)
Amortization of actuarial losses	(2,282)	(3,155)	(4,450)	(6,126)
Settlement loss	$ (247)	$ 0	$ (247)	$ 0