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Sales of Advances and MSRs - Schedule of MSRs and Advances Sold (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]              
Carrying value of assets sold       $ 0      
Gain (loss) on sale $ 41,246,000 $ 0 $ 97,958,000 0      
Total net cash received     598,059,000 $ 287,000 $ 287,000 $ 34,754,000 $ 0
Mortgage Servicing Rights [Member]              
Servicing Assets at Fair Value [Line Items]              
Carrying value of assets sold     662,923,000        
Gain (loss) on sale     97,958,000        
Plus: Accrued expenses and reserves     19,529,000        
Sales price     780,410,000        
Amount due from purchaser at September 30     98,545,000        
Amount paid to purchasers for estimated representation and warranty obligations, compensatory fees for foreclosures that may ultimately exceed investor timelines and related indemnification obligations     83,806,000        
Total net cash received     598,059,000        
Advances And Match Funded Advances [Member]              
Servicing Assets at Fair Value [Line Items]              
Carrying value of assets sold     321,164,000        
Gain (loss) on sale     0        
Plus: Accrued expenses and reserves     0        
Sales price     321,164,000        
Amount due from purchaser at September 30     35,226,000        
Amount paid to purchasers for estimated representation and warranty obligations, compensatory fees for foreclosures that may ultimately exceed investor timelines and related indemnification obligations     0        
Total net cash received     $ 285,938,000