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LONG-TERM DEBT AND LINES OF CREDIT - Effect on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Disclosure [Abstract]        
Net unrealized gains (losses) recognized in other comprehensive income (loss) $ (410) $ (5,630) $ 584 $ (53,526)
Net unrealized losses reclassified out of other comprehensive income (loss) to interest expense $ 9,662 $ 9,982 $ 20,500 $ 14,653