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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in plan assets |  |  |
Total beginning balance | $ 547,484 | $ 487,094 |
Total ending balance |  | 547,484 | $ 487,094
Pension Benefits |  |  |
Change in benefit obligation |  |  |
Obligation at January 1 | 777,645 | 881,932 |
Service cost | 7,964 | 8,994 | 8,279
Interest cost | 27,835 | 26,168 | 27,047
Participant contributions | 11 | 0 |
Actuarial loss (gain) | 103,374 | (57,378) |
Medicare Part D subsidy | 0 | 0 |
Exchange rate changes | 7,687 | (12,742) |
Benefits paid | (41,247) | (41,132) |
Prior Service Cost | 0 | 737 |
Other | 0 | (28,934) |
Obligation at December 31 | 883,269 | 777,645 | 881,932
Change in plan assets |  |  |
Total beginning balance | 487,094 | 563,825 |
Actual return on plan assets | 70,893 | (18,951) |
Employer contributions | 25,915 | 24,357 |
Participant contributions | 11 | 0 |
Medicare Part D subsidy | 0 | 0 |
Exchange rate changes | 7,328 | (12,071) |
Benefits paid | (41,247) | (41,132) |
Other | (2,510) | (28,934) |
Total ending balance | 547,484 | 487,094 | 563,825
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |
Deferred charges and other assets | 5,353 | 11,039 |
Other accrued liabilities | (8,810) | (9,175) |
Deferred credits and other liabilities | (332,328) | (292,415) |
Funded status and net plan liability recognized at December 31 | (335,785) | (290,551) |
Other Postretirement Benefits |  |  |
Change in benefit obligation |  |  |
Obligation at January 1 | 94,779 | 106,276 |
Service cost | 1,559 | 1,965 | 1,601
Interest cost | 3,864 | 3,427 | 3,444
Participant contributions | 1,930 | 2,104 |
Actuarial loss (gain) | 10,503 | (13,778) |
Medicare Part D subsidy | 234 | 325 |
Exchange rate changes | 30 | (67) |
Benefits paid | (4,498) | (5,473) |
Prior Service Cost | 0 | 0 |
Other | 0 | 0 |
Obligation at December 31 | 108,401 | 94,779 | 106,276
Change in plan assets |  |  |
Total beginning balance | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 2,333 | 3,044 |
Participant contributions | 1,930 | 2,104 |
Medicare Part D subsidy | 234 | 325 |
Exchange rate changes | 0 | 0 |
Benefits paid | (4,497) | (5,473) |
Other | 0 | 0 |
Total 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 | (5,234) | (5,101) |
Deferred credits and other liabilities | (103,167) | (89,678) |
Funded status and net plan liability recognized at December 31 | $ (108,401) | $ (94,779) |

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