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Basis of Presentation and Summary of Significant Accounting Policies - Non-Compete Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, current [1] $ 12,113 $ 6,627  
Amortization expense 0 $ 0 $ 0
Non-compete agreements | Provider Companies and Major Energy Companies      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, current 1,200    
Intangible assets, non-current 1,400    
Amortization expense $ 900    
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.