Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses	$ 6,347	$ 5,167
Receivables at fair value	5,608	15,033
Allowance for uncollectible advances	164,225	146,781
Servicing rights at fair value	714,774	949,593
Other assets at fair value	29,394	87,937
Payables and accrued liabilities at fair value	1,250	11,804
Mortgage-backed debt at fair value	$ 348,682	$ 514,025
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	37,373,616	36,391,129
Common stock, shares outstanding	37,373,616	36,391,129
Variable Interest Entity, Primary Beneficiary [Member]
Mortgage-backed debt at fair value	$ 348,682	$ 514,025