DERIVATIVE INSTRUMENTS (Effect of Derivative Instruments Designated Cash Flow Hedges on Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	$ 1,871	$ 0
Amount of Gain (Loss) Recognized in AOCI	(3,425)	1,871
Amount of Gain (Loss) Reclassified from AOCI into Earnings	2,958	0
Balance in AOCI End of Year	(4,512)	1,871
Interest rate swap | Interest (expense)
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	1,871	0
Amount of Gain (Loss) Recognized in AOCI	(1,355)	1,871
Amount of Gain (Loss) Reclassified from AOCI into Earnings	(76)	0
Balance in AOCI End of Year	592	1,871
Cross-currency swap | Other income (expense)
Derivative Instruments, Gain (Loss) [Roll Forward]
Balance in AOCI Beginning of Year	0
Amount of Gain (Loss) Recognized in AOCI	(2,070)
Amount of Gain (Loss) Reclassified from AOCI into Earnings	3,034
Balance in AOCI End of Year	$ (5,104)	$ 0