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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Change in plan assets |  |  |  |  |
Total beginning balance | $ 519,357 |  |  |  |
Total ending balance | 563,825 | $ 519,357 |  |  |
Pension Benefits [Member] |  |  |  |  |
Change in benefit obligation |  |  |  |  |
Obligation at January 1 | 881,932 | 815,593 | $ 794,589 | $ 881,932 | $ 815,593
Service cost | 8,279 | 8,136 | 17,948 |  |
Interest cost | 27,047 | 25,185 | 33,168 |  |
Participant contributions |  |  |  |  |
Actuarial loss (gain) | 60,855 | 58,236 |  |  |
Medicare Part D subsidy |  |  |  |  |
Exchange rate changes | 18,751 | (30,447) |  |  |
Benefits paid | 39,910 | 40,928 |  |  |
Curtailments |  | 822 |  |  |
Other | (8,683) |  |  |  |
Obligation at December 31 | 881,932 | 815,593 | 794,589 |  |
Change in plan assets |  |  |  |  |
Total beginning balance | 519,357 | 521,682 |  |  |
Actual return on plan assets | 50,079 | 61,860 |  |  |
Employer contributions | 24,918 | 8,186 |  |  |
Participant contributions |  |  |  |  |
Medicare Part D subsidy |  |  |  |  |
Exchange rate changes | 18,064 | (30,609) |  |  |
Benefits paid | (39,910) | (40,928) |  |  |
Other |  |  |  | (8,683) | (834)
Total ending balance | 563,825 | 519,357 | 521,682 |  |
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31 |  |  |  |  |
Deferred charges and other assets |  |  |  | 5,905 | 7,591
Other accrued liabilities |  |  |  | (8,856) | (8,184)
Deferred credits and other liabilities |  |  |  | (315,156) | (295,643)
Funded status and net plan liability recognized at December 31 |  |  |  | (318,107) | (296,236)
Other Postretirement Benefits [Member] |  |  |  |  |
Change in benefit obligation |  |  |  |  |
Obligation at January 1 | 106,276 | 106,679 | 115,222 | 106,276 | 106,679
Service cost | 1,601 | 1,864 | 3,180 |  |
Interest cost | 3,444 | 3,800 | 4,883 |  |
Participant contributions | 2,075 | 1,278 |  |  |
Actuarial loss (gain) | (3,077) | (10,627) |  |  |
Medicare Part D subsidy | 318 | 510 |  |  |
Exchange rate changes | 46 | 20 |  |  |
Benefits paid | 4,810 | 5,369 |  |  |
Curtailments |  | (19) |  |  |
Other |  |  |  |  |
Obligation at December 31 | 106,276 | 106,679 | 115,222 |  |
Change in plan assets |  |  |  |  |
Total beginning balance |  |  |  |  |
Actual return on plan assets |  |  |  |  |
Employer contributions | 2,417 | 3,581 |  |  |
Participant contributions | 2,075 | 1,278 |  |  |
Medicare Part D subsidy | 318 | 510 |  |  |
Exchange rate changes |  |  |  |  |
Benefits paid | (4,810) | (5,369) |  |  |
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 |  |  |  | (5,392) | (5,267)
Deferred credits and other liabilities |  |  |  | (100,884) | (101,412)
Funded status and net plan liability recognized at December 31 |  |  |  | $ (106,276) | $ (106,679)

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