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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Long-term debt    
Debt Instrument [Line Items]    
Deferred debt issuance costs $ 9,513 $ 10,438
Asset-backed Securities    
Debt Instrument [Line Items]    
Deferred debt issuance costs $ 339 $ 542