Quarterly report pursuant to Section 13 or 15(d)

COMMON AND PREFERRED STOCK - Narrative (Details)

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COMMON AND PREFERRED STOCK - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total shares of preferred and common stock authorized for issuance (shares) 680,000,000         680,000,000      
Common stock, shares authorized (in shares) 675,000,000         675,000,000   675,000,000  
Common stock, par value (in dollars per share) $ 0.001         $ 0.001   $ 0.001  
Preferred stock, shares authorized (in shares) 5,000,000         5,000,000   5,000,000  
Preferred stock, par value (in dollars per share) $ 0.001         $ 0.001   $ 0.001  
Stock Activity [Abstract]                  
Common stock surrendered by certain employees to cover tax obligations (shares)           200,000      
Fair value of common stock surrendered by certain employees to cover tax obligations $ 0 $ 0 $ 0 $ 0 $ 1,000 $ 600,000      
Shares issued to satisfy contingent consideration in connection with acquisition (in shares)           5,602,000   83,731,000  
Shares of common stock issued to satisfy obligations in connection with debt exchange derivative liabilities (in shares)           7,200,000      
Stock Repurchase Program [Abstract]                  
Stock repurchase program, amount approved                 $ 150,000,000.0
Stock repurchased (in shares) 0     0   5,635,000 0 7,360,000  
Repurchase of stock           $ 16,300,000      
Repurchase of stock recorded as a settlement of contingent consideration liabilities           $ 1,200,000      
VEN Bakken LLC                  
Stock Activity [Abstract]                  
Shares issued to satisfy contingent consideration in connection with acquisition (in shares)           5,600,000      
Pivotal Acquisition                  
Stock Activity [Abstract]                  
Shares issued to satisfy contingent consideration in connection with acquisition (in shares)           8,800,000      
W Energy Acquisition                  
Stock Activity [Abstract]                  
Shares issued to satisfy contingent consideration in connection with acquisition (in shares)           7,600,000