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
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]    
Fair value at beginning of period $ 14,195 $ 12,414
(Gains) losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income (2,553) (232)
Unrealized gains (losses) on interest rate swaps included in accumulated other comprehensive income (27,114) 13,655
Fair value of end of period $ (15,472) $ 25,837