DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - AOCI (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 279,539	$ 909,507	$ 617,275	$ 278,195	$ 617,275
Other comprehensive income before reclassifications	0	0		0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0		0	(1,806)
Net current period other comprehensive income (loss)	0	0	(1,806)	0	(1,806)
Ending balance	284,393	966,260	909,507	284,393	966,260
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0	1,806	0	1,806
Ending balance	$ 0	$ 0	$ 0	$ 0	$ 0