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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension and postretirement benefits [Abstract] |  |  |  |
Amortization of net actuarial loss, Gross Amount | [1] | $ 2,317 | $ 3,760 | $ 4,763
Amortization of net actuarial loss, Income Tax (Provision) Benefit | [1] | (585) | (1,417) | (1,825)
Amortization of net actuarial loss, Net Amount | [1] | 1,732 | 2,343 | 2,938
Actuarial gains (losses), Gross Amount | [1] | 7,322 | 25,776 | (15,013)
Actuarial gains (losses), Income Tax (Provision) Benefit | [1] | (1,416) | (9,371) | 5,754
Actuarial gains (losses), Net Amount | [1] | 5,906 | 16,405 | (9,259)
Foreign currency translation adjustments, Gross Amount |  | (819) | (146) | 0
Foreign currency translation adjustments, Income Tax (Provision) Benefit |  | 0 | 0 | 0
Foreign currency translation adjustments, Net Amount |  | (819) | (146) | 0
Total other comprehensive income, Gross Amount |  | 8,820 | 29,390 | (10,250)
Total other comprehensive income, Income Tax (Provision) Benefit |  | (9,926) | (10,788) | 3,929
Total other comprehensive income (loss), net of taxes |  | (1,106) | 18,602 | (6,321)
ASU 2018-02 [Member] |  |  |  |
Pension and postretirement benefits [Abstract] |  |  |  |
Adoption of ASU 2018-02 - reclassification to retained earnings, Gross Amount |  | 0 | 0 | 0
Adoption of ASU 2018-02 - reclassification to retained earnings, Income Tax (Provision) Benefit |  | (7,925) | 0 | 0
Adoption of ASU 2018-02 - reclassification to retained earnings, Net Amount |  | $ (7,925) | $ 0 | $ 0
[1] | Actuarial gains (losses) are amortized into other income (expense). (See Note 11 - Retirement Plans)

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