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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of the Company's Financial Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial Assets:
Cash and cash equivalents	$ 101,904	$ 83,554
Fair Value	674,161	818,976
Derivative assets	182,115	150,296
Mezzanine loan and preferred equity investments, carrying value	123,944	138,323
Financial Liabilities
Financing arrangements	608,304	773,142
Derivative liabilities	467	498
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	128,273	0
Distressed residential mortgage loans held in securitization trusts, carrying amount	133,972	195,347
Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts (net)	235,700	307,700
Financial Liabilities
Distressed residential mortgage loans held in securitization trusts, carrying amount	369,700	503,100
Distressed residential mortgage loans
Financial Liabilities
Distressed residential mortgage loans held in securitization trusts, carrying amount	134,000	195,300
Equity Method Investments
Financial Assets:
Investment in unconsolidated entities, carrying value	10,242	18,927
Investments in unconsolidated entities, estimated fair value	41,026	60,332
Portfolio Investments
Financial Liabilities
Financing arrangements	608,304	773,142
Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	76,867	91,663
Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	7,990,619	6,624,896
Available-for-sale securities
Financial Liabilities
Investment securities, available for sale, at fair value (including $46,623 and $43,897 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively, and pledged securities of $493,632 and $690,592, as of September 30, 2017 and December 31, 2016, respectively)	46,623	43,897
Level 1
Financial Assets:
Cash and cash equivalents	101,904	83,554
Cash and cash equivalents, estimated fair value	101,904	83,554
Receivable for securities sold, carrying value	1,261	0
Receivable for securities sold, estimated fair value	1,261	0
Financial Liabilities
Payable for securities purchased, carrying value	181,718	148,015
Payable for securities purchased, estimated fair value	181,718	148,015
Level 3
Financial Assets:
Mortgage loans held for sale (net), carrying value	6,797	7,847
Mortgage loans held for sale (net), estimated fair value	6,899	7,959
Mortgage loans held for investment, carrying value	1,760	19,529
Mortgage loans held for investment, estimated fair value	1,900	19,641
Mezzanine loan and preferred equity investments, carrying value	122,578	100,150
Mezzanine loan and preferred equity investments, estimated fair value	124,436	101,408
Investment in unconsolidated entities, carrying value	51,268	79,259
Investments in unconsolidated entities, estimated fair value	51,342	79,390
Financial Liabilities
Secured debt, carrying value	98,371	158,867
Secured debt, estimated fair value	105,768	163,884
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	44,989	43,132
Level 3 | Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	76,867	91,663
Secured debt, estimated fair value	72,428	85,568
Level 3 | Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	7,990,619	6,624,896
Secured debt, estimated fair value	7,990,619	6,624,896
Level 3 | Residential mortgage loans held in securitization trusts
Financial Assets:
Residential mortgage loans held in securitization trusts (net)	79,875	95,144
Residential mortgage loans held in securitization trusts (net), estimated fair value	77,412	88,718
Level 3 | Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts (net)	369,651	503,094
Residential mortgage loans held in securitization trusts (net), estimated fair value	374,169	504,915
Level 3 | Residential mortgage loans, at fair value
Financial Assets:
Residential mortgage loans held in securitization trusts (net)	69,512	17,769
Residential mortgage loans held in securitization trusts (net), estimated fair value	69,512	17,769
Level 3 | Multi-family loans held in securitization trusts
Financial Assets:
Residential mortgage loans held in securitization trusts (net)	8,399,334	6,939,844
Residential mortgage loans held in securitization trusts (net), estimated fair value	8,399,334	6,939,844
Level 1 and 2
Financial Assets:
Derivative assets	182,115	150,296
Financial Liabilities
Derivative liabilities	467	498
Level 2
Financial Liabilities
Convertible notes, carrying value	128,273	0
Convertible notes, estimated fair value	138,697	0
Level 2 | Portfolio Investments
Financial Liabilities
Financing arrangements	608,304	773,142
Level 2 | Distressed residential mortgage loans
Financial Liabilities
Financing arrangements	$ 160,562	$ 192,419

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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