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Basis of Presentation and Summary of Significant Accounting Policies - Recent Accounting Pronouncements - Adopted Standards (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Current deferred tax liabilities   $ 900
Deferred tax assets [1] $ 55,047 23,380
Deferred tax liability [1] $ 938 853
Accounting Standards Update 2015-17 | New Accounting Pronouncement, Early Adoption, Effect    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Deferred tax assets   23,400
Deferred tax liability   $ 900
[1] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.