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Number of stages in an investment agreement.

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Face (par) amount of debt instrument at time of issuance.

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SEARCHLIGHT INVESTMENT (Details) $ in Thousands							3 Months Ended	9 Months Ended	12 Months Ended
SEARCHLIGHT INVESTMENT (Details) $ in Thousands	Oct. 01, 2021 USD ($)	Jul. 16, 2021 shares	Jul. 15, 2021	Apr. 01, 2021 USD ($)	Oct. 02, 2020 USD ($) shares	Sep. 13, 2020 USD ($) item	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items]
CPRs, estimated fair value							$ 105,800	$ 105,800		$ 123,200
Change in fair value of contingent payment rights							(2,205)	(99,619)
Deferred debt issuance costs							39,132	39,132		45,934
Searchlight
Schedule of Investments [Line Items]
Change in fair value of contingent payment rights							(2,200)	(99,600)
Investment Agreement \| Searchlight
Schedule of Investments [Line Items]
Capital commitment							75,000	75,000		75,000
Net present value receivable					$ 74,388		75,000	$ 75,000		74,700
Net unamortized discount					612
Number of stages \| item						2
Proceeds from issuance of shares					$ 350,000
Shares exchanged in Investment Agreement \| shares					6,352,842
Percentage of share issued		24.50%			8.00%
Additional shares upon conversion of contingent payment right \| shares		17,870,012			17,870,012
Percentage of additional shares approved after conversion of CPR			16.90%		16.90%
Aggregate principal amount					$ 395,500
Unamortized discount					146,018
Deferred debt issuance costs					$ 13,001
Investment Agreement \| Searchlight \| Subordinated Debt
Schedule of Investments [Line Items]
Interest rate (as a percent)					9.00%
Period of PIK option (in years)								5 years
Debt term (in years)								10 years
Carrying value							262,100	$ 262,100		238,700
Unamortized discount							140,300	140,300		144,800
Deferred debt issuance costs							$ 8,800	$ 8,800		$ 12,000
Paid-in-Kind interest	$ 16,500			$ 15,800
Investment Agreement \| Searchlight \| Forecast
Schedule of Investments [Line Items]
Capital commitment									$ 75,000
Additional shares upon conversion of contingent payment right \| shares									15,115,899
Percentage of additional shares approved after conversion of CPR									10.10%
Percentage of stock on an as-converted basis									35.00%
Investment Agreement \| Searchlight \| Forecast \| Subordinated Debt
Schedule of Investments [Line Items]
Preferred stock dividend rate									9.00%
Investment Agreement \| Searchlight \| Maximum \| Subordinated Debt
Schedule of Investments [Line Items]
Capital commitment						$ 425,000