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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Estimated fair value at end of period $ 598,147 $ 696,108 $ 679,256 $ 761,190
Mortgage Servicing Rights - Amortized Costs [Member]        
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Beginning balance, MSRs 363,722 377,379    
Additions recognized in connection with asset acquisitions 1,658 15,968    
Additions recognized on the sale of mortgage loans 18,604 26,494    
Sales and other transfers (814) (23,521)    
Servicing asset at amortized value, gross 383,170 396,320    
Amortization [1] (38,560) (18,595)    
Decrease (increase) in impairment valuation allowance [2] 1,551 (37,164)    
Ending balance, MSRs 346,161 340,561    
Estimated fair value at end of period $ 424,208 $ 357,817    
[1] During 2016, principally in the third quarter, we participated in HUD’s Aged Delinquent Portfolio Loan Sale (ADPLS) program, which accelerates FHA insurance claims for a population of significantly delinquent FHA loans. The expedited claim filing process allows a servicer to reduce significantly its standard claim losses on accepted loans by shortening the servicing timeline and related expenses, some of which are not reimbursed by FHA insurance. Our participation required that we recognize $23.1 million of life-to-date losses on the claims filed in the third quarter of 2016. This loss is reported in Servicing and origination expense in the unaudited consolidated statements of operations. Because the MSRs related to the loans that were assigned to HUD had negative carrying values, our recognition of the losses on the loans reduced the negative carrying value of the MSRs, thereby generating negative amortization expense for this population of MSRs. In the third quarter of 2016, this ADPLS-related negative amortization expense of $18.1 million exceeded the positive amortization expense on the remaining MSRs, generating net negative amortization for the quarter.
[2] Impairment of MSRs is recognized in Servicing and origination expense in the unaudited consolidated statements of operations. See Note 3 – Fair Value for additional information regarding impairment and the valuation allowance.