INCOME TAXES - Income Tax Expense Allocation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income from continuing operations	$ 50,118	$ 23,935	$ 2,004
Interest expense	0	(100)	200
Goodwill	0	0	(100)
Stockholders’ equity	(300)	(7,200)	(2,100)
Total income tax expense allocation	$ 49,800	$ 16,600	$ 0