Quarterly report pursuant to Section 13 or 15(d)

Components of Servicing Revenue (Details)

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Components of Servicing Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]          
Servicing fee income $ 80,690 $ 53,989 $ 218,022 $ 141,923  
Ancillary and other fee income 358 310 1,004 615  
Float income 8,570 3,088 19,447 5,930  
Servicing income 89,618 $ 57,387 238,473 $ 148,468  
Servicing advances $ 26,134   $ 26,134   $ 31,050