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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Advances [Roll Forward]      
Advances, beginning balance $ 257,882 $ 444,298 $ 893,914
Sales of advances [1] (444) (24,631) (253,335)
Collections of advances, charge-offs and other, net (67,132) (165,734) (224,414)
Net decrease in allowance for losses 21,487 3,949 28,133
Advances, ending balance $ 211,793 $ 257,882 $ 444,298
[1] Servicing advances sold primarily in connection with sales of MSRs which met the requirements for sale accounting and which were derecognized from our financial statements at the time of the sale.