INCOME TAXES (Details 2) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 27, 2017 subsidiary
Current:
Domestic - Luxembourg			$ (10,957)	$ (9,889)	$ (21,080)
Deferred:
Domestic - Luxembourg			(307,339)	5,791	297,336
Income tax (provision) benefit			(318,296)	(4,098)	276,256
Operating loss carryforwards	$ 1,355,400		1,355,400	1,355,500
Deferred tax assets, operating loss carryforwards	338,403		338,403	353,209
Valuation allowance	355,559		355,559	$ 46,751
Income tax expense, adjustment of deferred tax asset					6,300
Income tax expense, foreign income tax reserves	5,600	$ 1,600			$ 10,500
Change in valuation allowance			$ 308,800
Statutory tax rate			24.94%	26.01%	27.08%
Decrease in foreign taxes due to tax holidays			$ 300	$ 700	$ 900
Effect on diluted per share due to decrease in foreign tax holiday (in dollars per share) | $ / shares			$ 0.02	$ 0.04	$ 0.05
2017 Subsidiary Merger
Deferred:
Number of wholly-owned subsidiaries merged | subsidiary						2
Operating loss carryforwards					$ 1,300,000
Deferred tax assets, operating loss carryforwards					$ 342,600
Operating loss carryforwards, term					17 years
Valuation allowance					$ 41,600
Domestic - Luxembourg
Current:
Domestic - Luxembourg			$ 0	$ (275)	(737)
Deferred:
Domestic - Luxembourg			(308,657)	4,927	295,318
Change in valuation allowance			291,500
Change in Luxembourg statutory income tax rate			14,000
Foreign - U.S. federal
Current:
Foreign			187	(1,838)	(2,405)
Deferred:
Foreign			329	291	111
Foreign - U.S. state
Current:
Foreign			(174)	(336)	(364)
Deferred:
Foreign			341	(134)	210
Deferred tax assets, operating loss carryforwards	$ 200		200	300
Foreign - non-U.S.
Current:
Foreign			(10,970)	(7,440)	(17,574)
Deferred:
Foreign			$ 648	$ 707	$ 1,697