DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reassessed Estimated Fair Value of Award	$ 27,000				$ 25,700				$ 27,000	$ 25,700
Operating Income (Loss)	$ 12,062	$ 31,117	$ 29,121	$ 14,796	$ 9,411	$ 32,101	$ 24,813	$ 7,315	87,096	73,640
Derivative Instruments Credit Adjustment Liability						$ 6,600
Selling, General and Administrative Expenses [Member] | Employment Agreement Award [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Operating Income (Loss)									$ 4,900	$ (5,100)