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COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of year $ 2,807 $ 6,701 $ 5,348
Change in fair value of interest rate swaps - cash flow hedges (13,559) (3,894) 1,353
Balance at end of year $ (10,752) $ 2,807 $ 6,701