DERIVATIVE INSTRUMENTS (Decrease in Reported Notional Amount) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance, January 1, 2019	$ 202,609
Balance, June 30, 2019	109,659
Interest derivative instruments and total return swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance, January 1, 2019	198,278
Impact from expirations	(46,714)
Impact from terminations	(46,528)
Impact from settlements	(36)
Balance, June 30, 2019	$ 105,000