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 - Level 2 - Designated as Hedging Instrument - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]    
Fair value at beginning of period $ 12,414 $ 8,159
Swap ineffectiveness   9
Losses (Gains) on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (831) 1,958
Unrealized gains (losses) on interest rate swaps included in accumulated other comprehensive income 16,733 (2,715)
Fair value of end of period $ 28,316 $ 7,411