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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity	$ 2,255,557	$ 2,476,310	$ 2,536,568	$ 2,453,577
Cumulative translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity	(146,529)	(162,243)
Net actuarial loss and prior service cost
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity	(655,040)	(667,459)
Unrealized gain (loss) from cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity	(15,636)	(6,789)
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity	$ (817,205)	$ (836,491)	$ (911,634)	$ (710,836)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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