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OTHER LONG TERM ASSETS (Schedule of Long-Term Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Capital improvements in progress $ 1,595 $ 10,099
Collateral deposits on swap agreements 9,697 398
Value of acquired charter-out contracts, net 9,067 10,503
Long term receivables 0 0
Other 960 961
Other long-term assets $ 21,319 $ 21,961