INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision (benefit):
Federal		$ (2,849)	$ (31,844)	$ 23,343
State		2,569	1,964	3,662
Foreign		38,770	24,108	27,242
Current income tax provision (benefit)		38,490	(5,772)	54,247
Deferred income tax provision (benefit):
Federal		(21,792)	(255,477)	(100,798)
State		172	(28,364)	(9,518)
Foreign		(13,059)	(1,437)	(8,865)
Deferred income tax benefit		(34,679)	(285,278)	(119,181)
Income tax provision (benefit)	$ 257,000	$ 3,811	$ (291,050)	$ (64,934)