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Subsequent Events Narrative (Details) - USD ($)
$ in Thousands
Mar. 12, 2018
Dec. 31, 2017
Sep. 01, 2017
Mar. 06, 2017
Dec. 31, 2016
Dec. 01, 2016
Aug. 31, 2016
Subsequent Event [Line Items]              
Borrowings on lines of credit   $ 107,000     $ 75,000    
Flagstar Bank and JP Morgan Chase Bank | Unsecured Debt | Unsecured Revolving Credit Facility | Subsequent Event              
Subsequent Event [Line Items]              
Borrowings on lines of credit $ 30,000            
Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, and Flagstar Bank | Unsecured Debt | Unsecured Revolving Credit Facility              
Subsequent Event [Line Items]              
Borrowings on lines of credit     $ 130,000 $ 85,000   $ 70,000 $ 60,000