FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details) - Interest Rate Swap [Member] - Level 2 [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]
Fair value at beginning of period	$ (1,072)	$ 70
Unrealized losses included in interest expense	8	(193)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	775	281
Unrealized losses included in accumulated other comprehensive loss	(1,270)	(1,252)
Fair value of end of period	(1,559)	(1,094)
Designated as Hedging Instrument [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]
Fair value at beginning of period	(865)	0
Unrealized losses included in interest expense	0	0
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	775	281
Unrealized losses included in accumulated other comprehensive loss	(1,270)	(1,252)
Fair value of end of period	(1,360)	(971)
Not Designated as Hedging Instrument [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]
Fair value at beginning of period	(207)	70
Unrealized losses included in interest expense	8	(193)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	0	0
Unrealized losses included in accumulated other comprehensive loss	0	0
Fair value of end of period	$ (199)	$ (123)