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Business Combinations - Purchase Allocation for Acquired Assets and Liabilities and Non Controlling Interests (Details) - USD ($)
$ in Thousands
Feb. 24, 2017
Nov. 30, 2016
Sep. 09, 2016
Jan. 26, 2016
Kern Phase 1(a) Assets        
Business Acquisition [Line Items]        
Property and equipment       $ 9,510
Related party payable       (3,435)
Asset retirement obligation       (322)
Noncontrolling interest       (866)
Net assets acquired       $ 4,887
Kern Phase 1(b) Assets        
Business Acquisition [Line Items]        
Property and equipment     $ 18,856  
Related party payable     (7,123)  
Asset retirement obligation     (785)  
Noncontrolling interest     (1,794)  
Net assets acquired     $ 9,154  
Kern Phase 2(a) Assets        
Business Acquisition [Line Items]        
Property and equipment   $ 14,873    
Related party payable   (4,504)    
Asset retirement obligation   (623)    
Noncontrolling interest   (1,332)    
Net assets acquired   $ 8,414    
Kern Phase 2(b) Assets        
Business Acquisition [Line Items]        
Property and equipment $ 11,872      
Related party payable (4,287)      
Asset retirement obligation (493)      
Noncontrolling interest (1,078)      
Net assets acquired $ 6,014