DERIVATIVE INSTRUMENTS (Effect of Derivative Instruments Designated Cash Flow Hedges on Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	$ (4,512)	$ 1,871
Amount of Gain (Loss) Recognized in AOCI	11,709	(3,425)	$ 1,871
Amount of Gain (Loss) Reclassified from AOCI into Earnings	13,400	2,958
Balance in AOCI End of Year	(6,203)	(4,512)	1,871
Interest rate swap | Interest income (expense) | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	592	1,871
Amount of Gain (Loss) Recognized in AOCI	924	(1,355)
Amount of Gain (Loss) Reclassified from AOCI into Earnings	897	(76)
Balance in AOCI End of Year	619	592	1,871
Cross-currency swap | Interest income (expense) | Net Investment Hedges
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	0
Amount of Gain (Loss) Recognized in AOCI	1,723
Amount of Gain (Loss) Reclassified from AOCI into Earnings	2,355
Balance in AOCI End of Year	(632)	0
Cross-currency swap | Other income (expense) | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	(5,104)	0
Amount of Gain (Loss) Recognized in AOCI	9,062	(2,070)
Amount of Gain (Loss) Reclassified from AOCI into Earnings	10,148	3,034
Balance in AOCI End of Year	$ (6,190)	$ (5,104)	$ 0