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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedules of Accumulate Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of the period | $ 1,796,304 | $ 1,909,826 | $ 1,916,179
Other comprehensive (loss) income income before reclassification | (20,743) | 1,773 | 3,050
Balance at end of the period | 1,825,791 | 1,796,304 | 1,909,826
Share of affiliates comprehensive (loss) income |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of the period | 5,030 | 3,414 | (192)
Other comprehensive (loss) income income before reclassification | (24,324) | 1,616 | 3,606
Balance at end of the period | (19,294) | 5,030 | 3,414
Pension and post retirement benefit plan adjustments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of the period | (12,799) | (12,956) | (12,400)
Other comprehensive (loss) income income before reclassification | 3,581 | 157 | (556)
Balance at end of the period | (9,218) | (12,799) | (12,956)
Total accumulated comprehensive (loss) income |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance at beginning of the period | (7,769) | (9,542) | (12,592)
Balance at end of the period | $ (28,512) | $ (7,769) | $ (9,542)

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