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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension and postretirement benefits [Abstract]        
Amortization of net actuarial loss, gross amount $ 688 $ 304 $ 1,683 $ 414
Amortization of net actuarial loss, income tax provision (174) (77) (424) (105)
Amortization of net actuarial loss, net amount 514 227 1,259 309
Actuarial gains (losses), gross amount 4,128 (3,609) 4,128 (3,609)
Actuarial gains (losses), income tax provision (1,035) 905 (1,035) 905
Actuarial gains (losses), net amount 3,093 (2,704) 3,093 (2,704)
Foreign currency translation, gross amount (86) 351 (583) (923)
Foreign currency translation, income tax provision     0 0
Foreign currency translation, net amount (86) 351 (583) (923)
Total other comprehensive income, gross amount 4,730 (2,954) 5,228 (4,118)
Total other comprehensive income, income tax provision (1,209) 828 (1,459) 800
Total other comprehensive income (loss), net of taxes $ 3,521 $ (2,126) $ 3,769 $ (3,318)