Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Schedule of Corporate Bonds) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortised Cost		$ 9,049	$ 8,516
Unrealized gain/(losses)		631	915
Fair value		9,680	9,431	$ 12,753
NorAm Drilling
Debt Securities, Available-for-sale [Line Items]
Amortised Cost		4,132	4,132
Unrealized gain/(losses)		487	511
Fair value		$ 4,619	4,643	$ 4,700
NT Rig Holdco 12%
Debt Securities, Available-for-sale [Line Items]
Redemption price, percentage		12.00%
Amortised Cost		$ 4,917	3,567
Unrealized gain/(losses)		144	404
Fair value		$ 5,061	3,971
NT Rig Holdco 7.5%
Debt Securities, Available-for-sale [Line Items]
Redemption price, percentage	7.50%	7.50%
Amortised Cost		$ 0	817
Unrealized gain/(losses)		0	0
Fair value		$ 0	$ 817