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Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest expense $ (3,349) $ (2,991)
Net sales 341,802 288,332
Income before income taxes 52,376 38,309
Tax benefit (14,073) (9,461)
Total reclassifications in the period 38,303 28,848
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications in the period (1,535) (1,845)
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 (83) (146)
Tax benefit 27 55
Income from continuing operations (56) (91)
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 (53) (151)
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 (30) 5
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 (2,380) (2,689)
Tax benefit 901 935
Income from continuing operations (1,479) (1,754)
Amortization of prior-service credits, net (92) 43
Amortization of actuarial losses (2,549) (2,732)
Settlement gain $ 261 $ 0