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Business Acquisitions - Schedule of Supplemental Pro Forma Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Increase in valuation of acquired MSRs $ (134,561) $ 41,448 $ 121,705 $ 91,695
Total net increase in revenue 283,515 238,278 861,741 752,116
Adjust depreciation expense to amortize internally developed software acquired from PHH on a straight-line basis based on a useful life of three years 6,459 5,558 26,020 18,199
Income tax benefit based on management’s estimate of the blended applicable statutory tax rates and observing the continued need for a valuation allowance $ 4,450 845 $ 13,264 4,541
PHH Corporation [Member]        
Business Acquisition [Line Items]        
Acquisition related costs   (9,384)   (18,548)
PHH Corporation [Member] | Fair Value Adjustments In Connection With Acquisition [Member]        
Business Acquisition [Line Items]        
Increase in valuation of acquired MSRs   23,360   24,442
Adjust interest expense for a total net decline   (18,382)   (30,598)
Total net increase in revenue   39,156   120,616
Adjust depreciation expense to amortize internally developed software acquired from PHH on a straight-line basis based on a useful life of three years   245   735
Income tax benefit based on management’s estimate of the blended applicable statutory tax rates and observing the continued need for a valuation allowance   $ 1,158   $ (300)