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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension and postretirement benefits [Abstract]        
Amortization of net actuarial loss, Gross Amount [1] $ 871 $ 231 $ 1,285 $ 694
Amortization of net actuarial loss, Income Tax (Provision) Benefit [1] (219) (59) (324) (177)
Amortization of net actuarial loss, Net Amount [1] 652 172 961 517
Actuarial gains (losses), Gross Amount [1] (6,592) 0 (10,201) 8,167
Actuarial gains (losses), Income Tax (Provision) Benefit [1] 1,661 0 2,566 (2,044)
Actuarial gains (losses), Net Amount [1] (4,931) 0 (7,635) 6,123
Foreign currency translation, Gross Amount (239) (618) (1,162) (542)
Foreign currency translation, Income Tax (Provision) Benefit 0 0 0 0
Foreign currency translation, Net Amount (239) (618) (1,162) (542)
Total other comprehensive income, Gross Amount (5,960) (387) (10,078) 8,319
Total other comprehensive income, Income Tax (Provision) Benefit 1,442 (59) 2,242 (2,221)
Total other comprehensive income (loss), net of taxes $ (4,518) $ (446) $ (7,836) $ 6,098
[1] Actuarial gains (losses) are amortized into other income. (See Note 13, Retirement Plans)