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Goodwill, Customer Relationships and Trademarks - Roll Forward (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]      
Balance at beginning of period $ 18,379,000 [1] $ 0 $ 0
Balance at end of period 79,147,000 [1] 18,379,000 [1] 0
Finite-lived Intangible Assets [Roll Forward]      
Additions 0 0 0
Amortization expense 0 0 0
Balance at end of period 39,862    
Customer Relationships— Acquired & Non-Compete Agreements      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period 10,380,000 0 0
Additions 0 0 0
Amortization expense (27,157,000) (4,503,000) 0
Balance at end of period 31,911,000 10,380,000 0
Customer Relationships— Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period 3,049,000 1,501,000 0
Additions 0 2,731,000 1,589,000
Amortization expense (1,437,000) (1,183,000) (88,000)
Balance at end of period 1,612,000 3,049,000 1,501,000
Trademarks      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period 1,194,000 0 0
Additions 0 0 0
Amortization expense (357,000) (74,000) 0
Balance at end of period 6,339,000 1,194,000 0
Customer Relationships      
Finite-lived Intangible Assets [Roll Forward]      
Amortization expense (28,600,000) (5,700,000) $ (100,000)
Cost of Revenue | Customer Relationships      
Finite-lived Intangible Assets [Roll Forward]      
Amortization expense (15,800,000)    
CenStar      
Goodwill [Roll Forward]      
Balance at beginning of period 6,396,000    
Acquisitions   6,396,000  
Balance at end of period   6,396,000  
CenStar | Customer Relationships— Acquired & Non-Compete Agreements      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions   5,494,000  
CenStar | Customer Relationships— Other      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions   0  
CenStar | Trademarks      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions   651,000  
Oasis      
Goodwill [Roll Forward]      
Acquisitions   11,983,000  
Oasis | Customer Relationships— Acquired & Non-Compete Agreements      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions   9,389,000  
Oasis | Customer Relationships— Other      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions   0  
Oasis | Trademarks      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions   $ 617,000  
Provider Companies      
Goodwill [Roll Forward]      
Acquisitions 26,040,000    
Balance at end of period 26,040,000    
Provider Companies | Customer Relationships— Other      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions 0    
Major Energy Companies      
Goodwill [Roll Forward]      
Acquisitions 34,728,000    
Major Energy Companies | Customer Relationships— Other      
Finite-lived Intangible Assets [Roll Forward]      
Acquisitions $ 0    
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.