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Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period $ (63,681)    
Other Comprehensive Income (Loss), Net of Income Tax 9,478 $ (4,404) $ (3,540)
Accumulated other comprehensive income (loss), end of the period (54,203) (63,681)  
Accumulated Other Comprehensive Loss [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (63,681) (59,277) (55,737)
Other comprehensive income (loss) before reclassifications, net of tax 3,914 (5,498) 803
Amounts reclassified from accumulated other comprehensive income (loss) before tax 7,337 1,443 (5,726)
Reclassification from AOCI, Current Period, Tax (1,773) (349) 1,383
Other Comprehensive Income (Loss), Net of Income Tax 9,478 (4,404) (3,540)
Accumulated other comprehensive income (loss), end of the period (54,203) (63,681) (59,277)
Cash Flow Hedging Gain (Loss) [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (5,945) 493 4,085
Other comprehensive income (loss) before reclassifications, net of tax 6,560 (5,393) 2,936
Amounts reclassified from accumulated other comprehensive income (loss) before tax 4,010 (1,378) (8,607)
Reclassification from AOCI, Current Period, Tax (969) 333 2,079
Other Comprehensive Income (Loss), Net of Income Tax 9,601 (6,438) (3,592)
Accumulated other comprehensive income (loss), end of the period 3,656 (5,945) 493
Pension Liability [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (36,620) (31,691) (31,718)
Other comprehensive income (loss) before reclassifications, net of tax 4,426 (7,068) (2,158)
Amounts reclassified from accumulated other comprehensive income (loss) before tax 3,327 2,821 2,881
Reclassification from AOCI, Current Period, Tax (804) (682) (696)
Other Comprehensive Income (Loss), Net of Income Tax 6,949 (4,929) 27
Accumulated other comprehensive income (loss), end of the period (29,671) (36,620) (31,691)
Cumulative Translation Adjustment [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (21,116) (28,079) (28,104)
Other comprehensive income (loss) before reclassifications, net of tax (7,072) 6,963 25
Amounts reclassified from accumulated other comprehensive income (loss) before tax 0 0 0
Reclassification from AOCI, Current Period, Tax 0 0 0
Other Comprehensive Income (Loss), Net of Income Tax (7,072) 6,963 25
Accumulated other comprehensive income (loss), end of the period $ (28,188) $ (21,116) $ (28,079)