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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]      
Mortgage servicing rights, at fair value $ 787,344 $ 93,901 $ 116,029
Loans held for sale, at fair value 235,909 401,120 503,753
Other assets, at fair value $ 18,551 7,335 0
Financing liabilities, at fair value   $ 2,058,693 $ 1,249,380
Convertible preferred stock, Series A, par value (in dollars per share)     $ 0.01
Convertible preferred stock, Series A, shares authorized (in shares)     200,000
Convertible preferred stock, Series A, shared issued (in shares)     62,000
Convertible preferred stock, Series A, shares outstanding (in shares)     62,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000 200,000,000
Common stock, shares issued (in shares) 125,390,482 125,215,615 135,176,271
Common stock, shares outstanding (in shares) 125,390,482 125,215,615 135,176,271