INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ 10,534	$ (4,292)	$ 63,716	$ (3,109)
Effective tax rates (as a percent)	(59.10%)	29.80%	(140.50%)	10.70%
Federal statutory income tax rate (as a percentage)			21.00%	35.00%
Income tax expense - excluding excess tax benefit on stock compensation	$ 3,787	$ 5,103	$ 11,475	$ 11,523
Excess tax benefits recognized in income tax expense	$ 14,321	$ 811	$ 75,191	$ 8,414