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Pension and Other Postretirement Benefits - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |
Net actuarial loss (gain), beginning of year | $ 48,395 |  |
Amortization of actuarial gain (loss) | (1,432) |  |
Actuarial loss | 39,329 |  |
Asset gain | (30,197) |  |
Settlement gain recognized | (7) | $ (1,300) |
Currency impact | 644 |  |
Net actuarial loss (gain), end of year | 56,746 | 48,395 |
Prior service cost, beginning of year | 2,725 |  |
Amortization of prior service cost | (169) | 42 | $ 41
Currency impact | 105 |  |
Prior service cost, end of year | 2,661 | 2,725 |
Other Benefits |  |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |
Net actuarial loss (gain), beginning of year | (3,047) |  |
Amortization of actuarial gain (loss) | 133 |  |
Actuarial loss | 2,374 |  |
Asset gain | 0 |  |
Settlement gain recognized | 0 |  |
Currency impact | (60) |  |
Net actuarial loss (gain), end of year | (600) | (3,047) |
Prior service cost, beginning of year | 0 |  |
Amortization of prior service cost | 0 |  | $ 0
Currency impact | 0 |  |
Prior service cost, end of year | $ 0 | $ 0 |

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- Definition Pension and Other Postretirement Benefit Plans, Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward] + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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