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RELATED PARTY TRANSACTIONS (Schedule of dividends and interest income received from shares held in and secured notes issued by related parties) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Related Party Transaction [Line Items]    
Dividend income - related parties $ 0 $ 3,884
ADS Maritime Holding    
Related Party Transaction [Line Items]    
Dividend income - related parties 0 1,508
Frontline    
Related Party Transaction [Line Items]    
Dividend income - related parties 0 2,376
NorAm Drilling    
Related Party Transaction [Line Items]    
Interest income $ 0 $ 210