INTEREST RATE SWAPS - GAINS (LOSSES) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Gains (losses) recognized in OCI on derivative (effective portion)	$ 54	$ 9	$ 330	$ (67)
Interest rate swap \| Cash flow hedge
Derivative [Line Items]
Gains (losses) recognized in OCI on derivative (effective portion)	54	9	330	(67)
Losses reclassified from OCI on derivative (effective portion)	(1)	(51)	(36)	(175)
Gains (losses) recognized in income on derivative (ineffective portion)	$ 0	$ 0	$ 0	$ 0

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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