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Basis of Presentation and Summary of Significant Accounting Policies - Customer Relationships (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 39,862    
Amortization expense 0 $ 0 $ 0
Impairment charges 0    
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense 28,600,000 5,700,000 100,000
Impairment charges $ 0 $ 0 $ 0
Customer Relationships | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 3 years    
Customer Relationships | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Amortization period 6 years