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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Amortized cost to fair value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Face value of bonds $ 8,293 $ 9,431
Corporate Bond Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,699 8,516
Unrealized gains/(losses) 594 915
Face value of bonds 8,293 9,431
NorAm Drilling Bond    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,132 4,132
Unrealized gains/(losses) 488 511
Face value of bonds 4,620 4,643
NT Rig Holdco 12%    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,567 3,567
Unrealized gains/(losses) 106 404
Face value of bonds 3,673 3,971
NT Rig Holdco 7.5%    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 0 817
Unrealized gains/(losses) 0 0
Face value of bonds $ 0 $ 817