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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Fair value election - transfer of MSRs carried at fair value $ 0 $ 0 $ (787,142)  
Estimated fair value at end of year 671,962 679,256 761,190 $ 93,901
Mortgage Servicing Rights - Amortized Costs [Member]        
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Beginning balance, MSRs 363,722 377,379 1,820,091  
Fair value election - transfer of MSRs carried at fair value [1] 0 0 (787,142)  
Additions recognized in connection with asset acquisitions 1,658 17,356 12,355  
Additions recognized on the sale of mortgage loans 20,738 37,230 34,962  
Sales (1,066) (24,452) (586,352)  
Servicing transfers and adjustments 252 0 0  
Mortgage servicing rights, gross 385,304 407,513 493,914  
Decrease (increase) in impairment valuation allowance [2] 3,366 (10,813) (17,341)  
Amortization (51,788) (32,978) (99,194)  
Ending balance, MSRs 336,882 363,722 377,379  
Estimated fair value at end of year $ 418,745 $ 467,911 $ 461,555  
[1] Effective January 1, 2015, we elected fair value accounting for a newly-created class of non-Agency MSRs, which were previously accounted for using the amortization method, based on a different strategy for managing the risks of the underlying portfolio compared to our other MSR classes. We recorded a cumulative-effect adjustment of $52.0 million (before deferred income taxes of $9.2 million) to retained earnings as of January 1, 2015 to reflect the excess of the fair value of these MSRs over their carrying amount.
[2] Impairment of MSRs is recognized in Servicing and origination expense in the consolidated statements of operations. See Note 3 — Fair Value for additional information regarding impairment and the valuation allowance.