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Major Accounting Policies - Changes in AOCI Balances by Component (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | $ 3,242,831 | $ 3,113,499 | $ 3,223,830
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | 93,631 | (63,936) | 50,170
BALANCE | 3,492,399 | 3,242,831 | 3,113,499
Accumulated Other Comprehensive Income (Loss) |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (496,669) | (432,775) | (484,212)
Other comprehensive income (loss) before reclassifications | 89,729 | (73,363) | (127,119)
Amounts reclassified from AOCI | 4,698 | 9,469 | 178,556
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | 94,427 | (63,894) | 51,437
BALANCE | (402,242) | (496,669) | (432,775)
Foreign Currency Translation |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (286,449) | (222,569) | (119,416)
Other comprehensive income (loss) before reclassifications | 75,272 | (63,880) | (109,361)
Amounts reclassified from AOCI |  |  | 6,208
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | 75,272 | (63,880) | (103,153)
BALANCE | (211,177) | (286,449) | (222,569)
Ownership Share of Equity Method Investees' Other Comprehensive Income (Loss) |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (31,913) | (37,949) | (30,436)
Other comprehensive income (loss) before reclassifications | (2,001) | 6,036 | (9,000)
Amounts reclassified from AOCI | 1,300 |  | 1,487
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | (701) | 6,036 | (7,513)
BALANCE | (32,614) | (31,913) | (37,949)
Defined Benefit Pension and Postretirement Plans |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (167,667) | (162,530) | (325,145)
Other comprehensive income (loss) before reclassifications | 11,456 | (9,888) | (5,382)
Amounts reclassified from AOCI | 4,153 | 4,751 | 167,997
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | 15,609 | (5,137) | 162,615
BALANCE | (152,058) | (167,667) | (162,530)
Unrealized Gain (Loss) on Derivative Contracts |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (10,375) | (9,255) | (8,954)
Other comprehensive income (loss) before reclassifications | 5,499 | (5,943) | (3,260)
Amounts reclassified from AOCI | (808) | 4,823 | 2,959
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | 4,691 | (1,120) | (301)
BALANCE | (5,684) | (10,375) | (9,255)
Unrealized Gain (Loss) on Available-For-Sale Securities |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (265) | (472) | (261)
Other comprehensive income (loss) before reclassifications | (497) | 312 | (116)
Amounts reclassified from AOCI | 53 | (105) | (95)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | (444) | 207 | (211)
BALANCE | (709) | (265) | (472)
Noncontrolling Interests |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | 117,640 | 116,152 | 112,959
Other comprehensive income (loss) before reclassifications | (835) | (341) | (1,543)
Amounts reclassified from AOCI | 39 | 299 | 276
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | (796) | (42) | (1,267)
BALANCE | 150,089 | 117,640 | 116,152
Accumulated Other Comprehensive Income (Loss), Net Attributable to Noncontrolling Interests |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (666) | (624) | 643
BALANCE | (1,462) | (666) | (624)
Foreign Currency Translation Attributable to Noncontrolling Interests |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (614) | (114) | 1,328
Other comprehensive income (loss) before reclassifications | (848) | (500) | (1,442)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | (848) | (500) | (1,442)
BALANCE | (1,462) | (614) | (114)
Unrealized Gain (Loss) on Derivative Contracts Attributable Noncontrolling Interests |  |  |
Changes in AOCI balances by component (after-tax) |  |  |
BALANCE | (52) | (510) | (685)
Other comprehensive income (loss) before reclassifications | 13 | 159 | (101)
Amounts reclassified from AOCI | 39 | 299 | 276
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) NET OF TAX | $ 52 | 458 | 175
BALANCE |  | $ (52) | $ (510)

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