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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Asset-backed securities issued    
Debt Instrument [Line Items]    
Deferred debt issuance costs $ 0 $ 542,000
Long-term debt    
Debt Instrument [Line Items]    
Deferred debt issuance costs $ 7,891,000 $ 10,438,000