Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details)

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FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details) - Interest Rate Swap [Member] - Level 2 [Member] - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]    
Fair value at beginning of period $ (972) $ (1,072)
Unrealized losses included in interest expense   8
Swap ineffectiveness 7  
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss 909 775
Unrealized losses included in accumulated other comprehensive loss (8,437) (1,270)
Fair value of end of period (8,493) (1,559)
Designated as Hedging Instrument [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]    
Fair value at beginning of period (972) (865)
Unrealized losses included in interest expense   0
Swap ineffectiveness 7  
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss 909 775
Unrealized losses included in accumulated other comprehensive loss (8,437) (1,270)
Fair value of end of period (8,493) (1,360)
Not Designated as Hedging Instrument [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]    
Fair value at beginning of period 0 (207)
Unrealized losses included in interest expense   8
Swap ineffectiveness 0  
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 $ 0 $ (199)