DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 617,275	$ 626,705
Ending balance	909,507	624,485
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,806	1,631
Other comprehensive income before reclassifications	0	1,199
Amounts reclassified from accumulated other comprehensive income (loss)	(1,806)	(16)
Net current period other comprehensive income	(1,806)	1,183
Ending balance	$ 0	$ 2,814