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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Change in plan assets |  |  |  |  |
Total beginning balance | $ 563,825 |  |  |  |
Total ending balance | 487,094 | $ 563,825 |  |  |
Pension Benefits [Member] |  |  |  |  |
Change in benefit obligation |  |  |  |  |
Obligation at January 1 | 777,645 | 881,932 | $ 815,593 | $ 777,645 | $ 881,932
Service cost | 8,994 | 8,279 | 8,136 |  |
Interest cost | 26,168 | 27,047 | 25,185 |  |
Participant contributions |  |  |  |  |
Actuarial loss (gain) | (57,378) | 60,855 |  |  |
Medicare Part D subsidy |  |  |  |  |
Exchange rate changes | (12,742) | 18,751 |  |  |
Benefits paid | (41,132) | (39,910) |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 737 |  |  |  |
Other | (28,934) | (8,683) |  |  |
Obligation at December 31 | 777,645 | 881,932 | 815,593 |  |
Change in plan assets |  |  |  |  |
Total beginning balance | 563,825 | 519,357 |  |  |
Actual return on plan assets | (18,951) | 50,079 |  |  |
Employer contributions | 24,357 | 24,918 |  |  |
Participant contributions |  |  |  |  |
Medicare Part D subsidy |  |  |  |  |
Exchange rate changes | 12,071 | (18,064) |  |  |
Benefits paid | (41,132) | (39,910) |  |  |
Other |  |  |  | (28,934) | (8,683)
Total ending balance | 487,094 | 563,825 | 519,357 |  |
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |  |  |
Deferred charges and other assets |  |  |  | 11,039 | 5,905
Other accrued liabilities |  |  |  | (9,175) | (8,856)
Deferred credits and other liabilities |  |  |  | (292,415) | (315,156)
Funded status and net plan liability recognized at December 31 |  |  |  | (290,551) | (318,107)
Other Postretirement Benefits [Member] |  |  |  |  |
Change in benefit obligation |  |  |  |  |
Obligation at January 1 | 94,779 | 106,276 | 106,679 | 94,779 | 106,276
Service cost | 1,965 | 1,601 | 1,864 |  |
Interest cost | 3,427 | 3,444 | 3,800 |  |
Participant contributions | 2,104 | 2,075 |  |  |
Actuarial loss (gain) | (13,778) | (3,077) |  |  |
Medicare Part D subsidy | 325 | 318 |  |  |
Exchange rate changes | (67) | 46 |  |  |
Benefits paid | (5,473) | (4,810) |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax |  |  |  |  |
Other |  |  |  |  |
Obligation at December 31 | 94,779 | 106,276 | 106,679 |  |
Change in plan assets |  |  |  |  |
Total beginning balance |  |  |  |  |
Actual return on plan assets |  |  |  |  |
Employer contributions | 3,044 | 2,417 |  |  |
Participant contributions | 2,104 | 2,075 |  |  |
Medicare Part D subsidy | 325 | 318 |  |  |
Exchange rate changes |  |  |  |  |
Benefits paid | (5,473) | (4,810) |  |  |
Other |  |  |  |  |
Total ending balance |  |  |  |  |
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |  |  |
Deferred charges and other assets |  |  |  |  |
Other accrued liabilities |  |  |  | (5,101) | (5,392)
Deferred credits and other liabilities |  |  |  | (89,678) | (100,884)
Funded status and net plan liability recognized at December 31 |  |  |  | $ (94,779) | $ (106,276)

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