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LONG-TERM DEBT AND LINES OF CREDIT - Effect on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Net unrealized losses recognized in other comprehensive loss $ (52,742) $ (90,238) $ (7,553)
Net unrealized losses (gains) reclassified out of other comprehensive loss to interest expense $ 36,510 $ 2,257 $ (4,792)