Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details)

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FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest Rate Swaps Measured at Fair Value      
Gains on interest rate swaps reclassified into interest expense from accumulated other comprehensive income $ 14,520 $ (3,337) $ (1,817)
Unrealized losses on interest rate swaps included in accumulated other comprehensive income (73,544) (29,941) 3,598
Level 2 | Interest rate swap | Designated as hedging instrument      
Interest Rate Swaps Measured at Fair Value      
Cash flow hedge ineffectiveness included in accumulated other comprehensive income 69 68  
Level 2 | Interest rate swap | Designated as hedging instrument | Cash flow hedges      
Interest Rate Swaps Measured at Fair Value      
Fair value at beginning of period (18,963) 14,247  
Fair value at end of period $ (77,918) $ (18,963) $ 14,247