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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |
Net actuarial loss (gain), beginning of year | $ 56,746 |  |
Amortization of actuarial gain (loss) | (2,930) |  |
Actuarial loss | 42,048 |  |
Asset gain | (16,113) |  |
Settlement loss recognized | (3,153) |  | $ (1,300)
Divestitures and acquisitions | 335 |  |
Currency impact | 3,738 |  |
Net actuarial loss (gain), end of year | 80,671 | $ 56,746 |
Prior service cost, beginning of year | 2,661 |  |
Amortization of prior service cost | (190) | (169) | 42
Prior service cost occurring during the year | 226 |  |
Currency impact | 101 |  |
Prior service cost, end of year | 2,798 | 2,661 |
Other Benefits |  |  |
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |
Net actuarial loss (gain), beginning of year | (600) |  |
Amortization of actuarial gain (loss) | 59 |  |
Actuarial loss | 110 |  |
Asset gain | 0 |  |
Settlement loss recognized | 0 |  |
Divestitures and acquisitions | 0 |  |
Currency impact | (5) |  |
Net actuarial loss (gain), end of year | (436) | (600) |
Prior service cost, beginning of year | 0 |  |
Amortization of prior service cost | 0 | 0 | $ 0
Prior service cost occurring during the year | 0 |  |
Currency impact | 0 |  |
Prior service cost, end of year | $ 0 | $ 0 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&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=121641772&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&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=121641772&loc=SL7669686-108580 + Details
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