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Employee and Retiree Benefit Plans - Plans' Benefit Obligations and Fair Value of Assets and Statement of Funded Status (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in plan assets |  |  |
Beginning balance | $ 547,484 |  |
Ending balance | 586,720 | $ 547,484 |
Pension Benefits |  |  |
Change in benefit obligation |  |  |
Beginning balance | 883,269 | 777,645 |
Service cost | 7,967 | 7,964 | $ 8,994
Interest cost | 21,127 | 27,835 | 26,168
Participant contributions | 0 | 11 |
Actuarial loss (gain) | 107,258 | 103,374 |
Medicare Part D subsidy | 0 | 0 |
Exchange rate changes | 7,074 | 7,687 |
Benefits paid | (46,066) | (41,247) |
Curtailments | (7,596) | 0 |
Special termination benefits | 8,434 | 0 |
Ending balance | 981,467 | 883,269 | 777,645
Change in plan assets |  |  |
Beginning balance | 547,484 | 487,094 |
Actual return on plan assets | 48,115 | 70,893 |
Employer contributions | 30,178 | 25,915 |
Participant contributions | 0 | 11 |
Medicare Part D subsidy | 0 | 0 |
Exchange rate changes | 7,009 | 7,328 |
Benefits paid | (46,066) | (41,247) |
Other | 0 | (2,510) |
Ending balance | 586,720 | 547,484 | 487,094
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |
Deferred charges and other assets | 4,572 | 5,353 |
Other accrued liabilities | (9,468) | (8,810) |
Deferred credits and other liabilities | (389,851) | (332,328) |
Funded status and net plan liability recognized at December 31 | (394,747) | (335,785) |
Other Postretirement Benefits |  |  |
Change in benefit obligation |  |  |
Beginning balance | 108,401 | 94,779 |
Service cost | 1,373 | 1,559 | 1,965
Interest cost | 2,626 | 3,864 | 3,427
Participant contributions | 2,225 | 1,930 |
Actuarial loss (gain) | 3,758 | 10,503 |
Medicare Part D subsidy | 243 | 234 |
Exchange rate changes | 13 | 30 |
Benefits paid | (4,238) | (4,498) |
Curtailments | (6,023) | 0 |
Special termination benefits | 0 | 0 |
Ending balance | 108,378 | 108,401 | 94,779
Change in plan assets |  |  |
Beginning balance | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 1,770 | 2,333 |
Participant contributions | 2,225 | 1,930 |
Medicare Part D subsidy | 243 | 234 |
Exchange rate changes | 0 | 0 |
Benefits paid | (4,238) | (4,497) |
Other | 0 | 0 |
Ending balance | 0 | 0 | $ 0
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |
Deferred charges and other assets | 0 | 0 |
Other accrued liabilities | (5,298) | (5,234) |
Deferred credits and other liabilities | (103,080) | (103,167) |
Funded status and net plan liability recognized at December 31 | $ (108,378) | $ (108,401) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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