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Goodwill, Customer Relationships and Trademarks - Goodwill and Intangible Assets (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill $ 79,147,000 [1] $ 18,379,000 [1] $ 0 $ 0
Finite-Lived Intangible Assets [Line Items]        
Total 39,862      
Customer Relationships— Acquired & Non-Compete Agreements        
Finite-Lived Intangible Assets [Line Items]        
Cost 63,571,000 14,883,000    
Accumulated amortization (31,660,000) (4,503,000)    
Total 31,911,000 10,380,000 0 0
Customer Relationships— Other        
Finite-Lived Intangible Assets [Line Items]        
Cost 4,320,000 4,320,000    
Accumulated amortization (2,708,000) (1,271,000)    
Total 1,612,000 3,049,000 1,501,000 0
Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Cost 6,770,000 1,268,000    
Accumulated amortization (431,000) (74,000)    
Total $ 6,339,000 $ 1,194,000 $ 0 $ 0
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.