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Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period $ (55,737)    
Accumulated other comprehensive income (loss), end of the period (59,277) $ (55,737)  
Accumulated Other Comprehensive Loss [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (55,737) (49,078) $ (58,526)
Other comprehensive income (loss) before reclassifications, net of tax 803 (3,441) 7,208
Amounts reclassified from accumulated other comprehensive income (loss) before tax (5,726) 3,602 3,553
Reclassification from AOCI, Current Period, Tax 1,383 (871) (1,313)
Net current-period other comprehensive income (loss) (3,540) (710) 9,448
Accumulated other comprehensive income (loss), end of the period (59,277) (55,737) (49,078)
Cash Flow Hedging Gain (Loss) [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period 4,085 (3,530) 1,546
Other comprehensive income (loss) before reclassifications, net of tax 2,936 7,639 (5,529)
Amounts reclassified from accumulated other comprehensive income (loss) before tax (8,607) 913 718
Reclassification from AOCI, Current Period, Tax 2,079 (221) (265)
Net current-period other comprehensive income (loss) (3,592) 8,331 (5,076)
Accumulated other comprehensive income (loss), end of the period 493 4,085 (3,530)
Pension Liability [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (31,718) (25,813) (26,458)
Other comprehensive income (loss) before reclassifications, net of tax (2,158) (2,711) (1,142)
Amounts reclassified from accumulated other comprehensive income (loss) before tax 2,881 2,689 2,835
Reclassification from AOCI, Current Period, Tax (696) (650) (1,048)
Net current-period other comprehensive income (loss) 27 (672) 645
Accumulated other comprehensive income (loss), end of the period (31,691) (31,718) (25,813)
Cumulative Translation Adjustment [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (28,104) (19,735) (33,614)
Other comprehensive income (loss) before reclassifications, net of tax 25 (8,369) 13,879
Amounts reclassified from accumulated other comprehensive income (loss) before tax 0 0 0
Reclassification from AOCI, Current Period, Tax 0 0 0
Net current-period other comprehensive income (loss) 25 (8,369) 13,879
Accumulated other comprehensive income (loss), end of the period $ (28,079) (28,104) $ (19,735)
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Loss [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption   (5,949)  
Accounting Standards Update 2018-02 [Member] | Cash Flow Hedging Gain (Loss) [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption   (716)  
Accounting Standards Update 2018-02 [Member] | Pension Liability [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Cumulative Effect of New Accounting Principle in Period of Adoption   $ (5,233)