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COMMITMENTS AND CONTINGENCIES - Funding and Sale-Leaseback (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 29, 2016
Oct. 29, 2015
Feb. 28, 2017
Dec. 31, 2016
Dec. 31, 2015
Contractual Commitments          
Proceeds from sale of mining equipment leased back       $ 33,881 $ 100,000
Sale-leaseback of mining equipment, October 2015          
Contractual Commitments          
Proceeds from sale of mining equipment leased back   $ 100,000      
Term of lease   4 years      
Monthly rent under lease agreement   $ 1,900      
Balloon payment due at end of lease term (as a percent)   20.00%      
Deferred gain (loss)   $ 5,000      
Sale-leaseback transactions          
Contractual Commitments          
Proceeds from sale of mining equipment leased back $ 33,900        
Monthly rent under lease agreement $ 700        
Balloon payment due at end of lease term (as a percent) 20.00%        
Deferred gain (loss) $ (7,900)        
Sale-leaseback transactions | Minimum          
Contractual Commitments          
Term of lease 3 years        
Sale-leaseback transactions | Maximum          
Contractual Commitments          
Term of lease 4 years        
AllDale Minerals | Cavalier Minerals          
Contractual Commitments          
Remaining funding commitment       $ 6,300  
Funding Commitments | All Dale Minerals III | Alliance Minerals          
Contractual Commitments          
Investment commitment     $ 30,000    
Expected period of funding     2 years