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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Estimated fair value at end of period $ 1,074,247 $ 651,987 $ 671,962 $ 679,256
Mortgage Servicing Rights - Amortized Costs [Member]        
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Beginning balance, MSRs 336,882 363,722    
Fair value election - transfer of MSRs carried at fair value (361,670) [1] 0    
Additions recognized in connection with asset acquisitions 0 1,229    
Additions recognized on the sale of mortgage loans 0 8,126    
Sales and other transfers 0 (430)    
Servicing asset at amortized value, gross (24,788) 372,647    
Amortization [1] 0 (12,715)    
(Increase) decrease in impairment valuation allowance [1],[2] 24,788 (1,401)    
Ending balance, MSRs 0 358,531    
Estimated fair value at end of period $ 0 $ 462,289    
[1] Effective January 1, 2018, we elected fair value accounting for our MSRs previously accounted for using the amortization method, which included Agency MSRs and government-insured MSRs. This irrevocable election applies to all subsequently acquired or originated servicing assets and liabilities that have characteristics consistent with each of these classes. We recorded a cumulative-effect adjustment of $82.0 million to retained earnings as of January 1, 2018 to reflect the excess of the fair value of the Agency MSRs over their carrying amount. We also recognized the tax effect of this adjustment through an increase in retained earnings of $6.8 million and a deferred tax asset for the same amount. However, we established a full valuation allowance on the resulting deferred tax asset through a reduction in retained earnings. The government-insured MSRs were impaired by $24.8 million at December 31, 2017; therefore, these MSRs were already effectively carried at fair value.
[2] Impairment of MSRs is recognized in MSR valuation adjustments, net in the unaudited consolidated statements of operations for the three months ended March 31, 2017. Impairment valuation allowance balance of $24.8 million was reclassified to reduce the carrying value of the related MSRs on January 1, 2018 in connection with our fair value election. See Note 3 – Fair Value for additional information regarding impairment and the valuation allowance.