INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ (7,110)	$ (7,493)	$ (14,047)	$ (13,774)
Effective income tax rate			14.50%	17.30%
Income tax provision related to Tax Cuts and Jobs Act					$ 100
Global intangible low-taxed income	$ 1,700		$ 1,700