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Pension and Postretirement Benefits - Amounts Recognized in AOCI (Details) - Domestic Plans - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Pension Plans | Funded Plans |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | $ 8,681 | $ 9,090
Subtotal | 8,681 | 9,090
Less tax effect | (3,292) | (3,447)
Total | 5,389 | 5,643
Pension Plans | Unfunded Pension Plans |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | 2,587 | 2,496
Subtotal | 2,587 | 2,496
Less tax effect | (981) | (947)
Total | 1,606 | 1,549
Postretirement Benefit Plans |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | 2,784 | 2,710
Prior service credit | (351) | (1,598)
Subtotal | 2,433 | 1,112
Less tax effect | (923) | (422)
Total | 1,510 | 690
US Postretirement and Pension Plan |  |
Amounts recognized in accumulated other comprehensive income |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax | 14,052 | 14,296
Prior service credit | (351) | (1,598)
Subtotal | 13,701 | 12,698
Less tax effect | (5,196) | (4,816)
Total | $ 8,505 | $ 7,882

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