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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive loss, beginning balance $ (98,989) $ (95,397)  
Other comprehensive income (loss) before reclassifications, net of tax (4,878) (5,684)  
Amounts reclassified from accumulated other comprehensive loss, net of tax 3,748 2,092  
Net current-period other comprehensive income (loss) (1,130) (3,592)  
Accumulated other comprehensive loss, ending balance (100,119) (98,989) $ (95,397)
Other comprehensive income (loss) before reclassifications, tax amount (23) (77) (22)
Defined Benefit Pension Items      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive loss, beginning balance (98,734) (95,365)  
Other comprehensive income (loss) before reclassifications, net of tax (4,803) (5,461)  
Amounts reclassified from accumulated other comprehensive loss, net of tax 3,748 2,092  
Net current-period other comprehensive income (loss) (1,055) (3,369)  
Accumulated other comprehensive loss, ending balance (99,789) (98,734) (95,365)
Other comprehensive income (loss) before reclassifications, tax amount (1,492) (1,874)  
Amounts reclassified from AOCI, tax amount 1,164 718  
Other      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive loss, beginning balance (255) (32)  
Other comprehensive income (loss) before reclassifications, net of tax (75) (223)  
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0  
Net current-period other comprehensive income (loss) (75) (223)  
Accumulated other comprehensive loss, ending balance (330) (255) $ (32)
Other comprehensive income (loss) before reclassifications, tax amount $ (23) $ (77)