INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018
INCOME TAXES [Abstract]
Income tax provision		$ 678	$ 8,687	$ 19,499	$ 27,310
Effective income tax		4.20%	40.80%	29.70%	40.50%
Income Tax Disclosure [Line Items]
Federal income tax				35.00%
Change in tax rate, Provisional income tax expense		$ 2,600
Additions or reductions to gross unrecognized tax benefits		$ 0		$ 0
Forecast [Member]
Income Tax Disclosure [Line Items]
Federal income tax	21.00%					31.50%
Additional income tax benefit	$ (800)