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Description of Business and Basis of Presentation - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Oct. 20, 2015
Mar. 02, 2015
Apr. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 18, 2015
Jun. 30, 2015
May. 11, 2015
Description of Business and Basis of Presentation [Line Items]                      
Expected proceeds from sale of mortgage servicing rights       $ 598,059 $ 287 $ 287 $ 34,754 $ 0      
Repayment of SSTL           $ 5,809,239 $ 8,804,558 $ 822,137      
Agency Mortgage Servicing Rights [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
UPB of Agency MSRs sold       89,000,000              
Expected proceeds from sale of mortgage servicing rights       642,000              
Advance Funding Facility [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
Maximum borrowing capacity                 $ 1,700,000 $ 1,800,000  
Senior Secured Term Loan [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
Repayment of SSTL       $ 561,600              
Subsequent Event [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
Expected proceeds from sale of mortgage servicing rights     $ 852,000                
Repayment of SSTL     $ 840,000                
Subsequent Event [Member] | Advance Funding Facility [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
Maximum borrowing capacity                     $ 1,800,000
Subsequent Event [Member] | Senior Secured Term Loan [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
Repayment of SSTL $ 50,000                    
Subsequent Event [Member] | Amended Senior Secured Term Loan [Member]                      
Description of Business and Basis of Presentation [Line Items]                      
Percentage of net cash proceeds from permitted asset sales allowed to prepay loans 100.00% 75.00%