Changes in Accumulated Other Comprehensive Income by Component (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (16,841)	$ (14,571)	$ (11,883)
Net sales	1,495,889	1,436,499	1,230,754
Income before income taxes	207,495	195,699	182,621
Tax benefit	(41,309)	(136,284)	(47,020)
Total reclassifications in the period	166,186	59,415	$ 135,601
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications in the period	(10,827)	(7,914)
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	(1,393)	(787)
Tax benefit	310	257
Income from continuing operations	(1,083)	(530)
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	(277)	(545)
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	(1,116)	(242)
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	(12,769)	(11,166)
Tax benefit	3,025	3,782
Income from continuing operations	(9,744)	(7,384)
Amortization of prior-service credits, net	(580)	(378)
Amortization of actuarial losses	(12,189)	(10,833)
Curtailment gain	0	187
Settlement loss	$ 0	$ (142)