COMMON AND PREFERRED STOCK - Narrative (Details)								1 Months Ended	12 Months Ended
	Jul. 01, 2019 shares	Oct. 01, 2018 shares	Sep. 17, 2018 shares	Jun. 04, 2018 shares	May 15, 2018 USD ($) shares	Apr. 16, 2018 USD ($) shares	Apr. 10, 2018 USD ($) shares	Nov. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) payment $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	May 31, 2011 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)									675,000,000	675,000,000
Common stock, par value (in dollars per share) | $ / shares									$ 0.001	$ 0.001
Common stock, shares, issued (in shares)									406,085,183	378,333,070
Common stock, shares outstanding (in shares)									406,085,183	378,333,070
Preferred stock, shares authorized (in shares)									5,000,000	5,000,000
Preferred stock, par value (in dollars per share) | $ / shares									$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)									1,500,000	0
Preferred stock, shares outstanding (in shares)									1,500,000	0
Preferred stock, dividend rate, percentage									6.50%
Preferred stock, liquidation preference (in dollars per share) | $ / shares									$ 100
Undeclared accumulated dividends | $									$ 1,000,000.0
Shares issued upon conversion (in shares)									43.63
Redemption price per share | $ / shares									$ 2.292
Stock trigger rate for convertible preferred stock									145.00%
Number of semi-annual dividend payments for preferred stock | payment									8
Number of shares issued in transaction (in shares)						3,600,000	58,666,667
Proceeds from sale of stock | $						$ 5,200,000	$ 84,500,000
Stock repurchase program, amount approved | $												$ 150,000,000.0
Shares repurchased (in shares)									5,600,000
Common stock repurchased | $									$ 16,300,000
Cash consideration for repurchase of common stock | $									$ 15,108,000	$ 22,195,000	$ 0
Debt conversion, converted instrument, shares issued (in shares)									7,200,000
Repurchases of Common Stock | $									$ 15,108,000	$ 22,195,000
W Energy Partners LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of Common Stock | $								$ 10,000,000.0
Exchange Agreement | Other Supporting Noteholders
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in transaction (in shares)					103,200,000				32,800,000
Exchange Agreement | Unnamed Investors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in transaction (in shares)					34,700,000
Proceeds from sale of stock | $					$ 52,000,000.0
Pivotal Entities And W Energy Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)										7,400,000
Common stock repurchased | $										$ 23,900,000
W Energy Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased (in shares)									3,700,000
Common stock repurchased | $									$ 11,100,000
Salt Creek Oil And Gas, LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Asset acquisition, shares issued (in shares)				6,000,000.0
Acquisition of Oil and Natural Gas Properties (in shares)				6,000,000.0
Pivotal Entities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Asset acquisition, shares issued (in shares)			25,800,000
Acquisition of Oil and Natural Gas Properties (in shares)			25,800,000						10,200,000
W Energy Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Asset acquisition, shares issued (in shares)	5,600,000	51,500,000
Acquisition of Oil and Natural Gas Properties (in shares)		51,500,000							7,600,000
VEN Bakken LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Acquisition of Oil and Natural Gas Properties (in shares)									5,600,000
Contingent consideration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Settlements | $									$ 1,390,000
Contingent consideration | Pivotal Entities And W Energy Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock repurchased | $									$ 1,200,000	$ 1,700,000