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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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 326
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-Topic 320
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