FAIR VALUE MEASUREMENTS - Unobservable Inputs (Level 3) (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Fair Value Measurements Using Unobservable Inputs (Level 3)
Balance, beginning of period	$ (16,790)	$ (31,824)
Fair value adjustment	17	532
Accretion expense (recognized in general and administrative expenses)	(126)	(647)
Settlement of liability	0	15,149
Total	$ (16,899)	(16,790)
Goodwill
Fair Value Measurements Using Unobservable Inputs (Level 3)
Fair value adjustment		(300)
General and administrative
Fair Value Measurements Using Unobservable Inputs (Level 3)
Fair value adjustment		$ 800

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Fair Value Adjustment

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- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
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-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section 35
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-URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
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-Topic 820
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-Section 50
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