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Basis of Presentation and Summary of Significant Accounting Policies - Customer Acquisition Costs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Customer acquisition costs, current [1] $ 18,834,000 $ 13,389,000  
Customer acquisition costs, noncurrent [1] 6,134,000 3,808,000  
Amortization of acquisition costs 17,500,000 18,000,000 $ 18,500,000
Amortization of customer acquisition costs $ 0 $ 0  
California      
Finite-Lived Intangible Assets [Line Items]      
Amortization of customer acquisition costs     6,500,000
Massachusetts      
Finite-Lived Intangible Assets [Line Items]      
Amortization of customer acquisition costs     $ 200,000
Capitalized Direct Advertising Costs      
Finite-Lived Intangible Assets [Line Items]      
Average useful life 2 years    
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.