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Accumulated Other Comprehensive Loss (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) before income taxes $ (13,082) $ (3,639) $ 7,736 $ 23,225
Income tax provision (benefit) 7,212 1,764 1,657 (5,668)
Net income (loss) (5,870) (1,875) 9,393 17,557
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)        
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Net income (loss) [1] 26 (114) 11,486 (378)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Defined Benefit Plan Items        
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior-service cost (228) [1],[2] (228) [1],[2] (684) [1],[2] (684)
Income (loss) before income taxes [1] (228) (228) (684) (684)
Income tax provision (benefit) 57 [1] 60 [1] 171 [1] 180
Net income (loss) [1] (171) (168) (513) (504)
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Cash Flow Hedges        
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Interest payments 263 73 445 171
Income (loss) before income taxes [1] 263 73 445 171
Income tax provision (benefit) [1] (66) (19) (112) (45)
Net income (loss) [1] 197 $ 54 333 $ 126
Reclassifications Out of Accumulated Other Comprehensive Income (Loss) | Foreign Currency Translation Adjustment        
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]        
Realized loss on pre-existing investment 0 [1]   11,666  
Income (loss) before income taxes [1] 0   11,666  
Income tax provision (benefit) [1] 0   0  
Net income (loss) [1] $ 0   $ 11,666  
[1] Amounts in parentheses indicate credits to profit/loss
[2] This accumulated other comprehensive loss component is included in the computation of net periodic benefit cost (see Note 6).