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Financing Arrangements, Residential Mortgage Loans - Narrative (Details) - Deutsche Bank AG, Cayman Islands Branch - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
May 24, 2017
Pool of Distressed Residential Mortgage Loans      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreement, principal $ 100,000,000 $ 200,000,000  
Repurchase agreement, outstanding balance 123,600,000 $ 193,800,000  
Repurchase agreement uncommitted amount (in excess of) $ 150,000,000    
Repurchase agreement, interest rate (as a percent) 4.05% 3.26%  
Pool of Distressed Residential Mortgage Loans | LIBOR      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Basis spread on variable rate (as a percent) 2.50% 2.50%  
Residential Mortgage      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Repurchase agreement, principal   $ 100,000,000 $ 25,000,000
Repurchase agreement, outstanding balance $ 26,100,000 $ 0  
Repurchase agreement uncommitted amount (in excess of) $ 25,000,000    
Residential Mortgage | LIBOR      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Basis spread on variable rate (as a percent) 3.50%    
Repurchase agreement, interest rate (as a percent) 5.05%