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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	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financial Assets:
Cash and cash equivalents	$ 65,495	$ 95,191	$ 73,033
Fair Value	1,400,370	1,413,081
Derivative assets	9,815	846
Preferred equity and mezzanine loan investments, carrying value	99,032	117,822
Financial Liabilities
Financing arrangements	1,287,314	1,276,918
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	129,242	128,749
Distressed residential mortgage loans held in securitization trusts, carrying amount	119,201	121,791
Distressed residential mortgage loans
Financial Liabilities
Distressed residential mortgage loans held in securitization trusts, carrying amount	119,200	121,800
Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts, net	202,900	209,700
Financial Liabilities
Distressed residential mortgage loans held in securitization trusts, carrying amount	322,100	331,500
Equity Method Investments
Financial Assets:
Investment in unconsolidated entities, carrying value	8,417	8,320
Investments in unconsolidated entities, estimated fair value	43,504	42,823
Portfolio Investments
Financial Liabilities
Financing arrangements	1,287,314	1,276,918
Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	67,154	70,308
Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	8,953,467	9,189,459
Residential mortgage loans, at fair value | Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts, net	36,400	36,900
Residential mortgage loans, at fair value | Second Mortgage
Financial Assets:
Residential mortgage loans held in securitization trusts, net	63,100	50,200
Available-for-sale securities
Financial Liabilities
Investment securities, available for sale held in securitization trusts	48,857	47,922
Level 1
Financial Assets:
Cash and cash equivalents	65,495	95,191
Cash and cash equivalents, estimated fair value	65,495	95,191
Level 3
Financial Assets:
Mortgage loans held for sale, net, carrying value	5,473	5,507
Mortgage loans held for sale, net, estimated fair value	5,599	5,598
Mortgage loans held for investment, carrying value	1,760	1,760
Mortgage loans held for investment, estimated fair value	1,900	1,900
Preferred equity and mezzanine loan investments, carrying value	154,006	138,920
Preferred equity and mezzanine loan investments, estimated fair value	155,206	140,129
Investment in unconsolidated entities, carrying value	51,921	51,143
Investments in unconsolidated entities, estimated fair value	51,990	51,212
Financial Liabilities
Secured debt, carrying value	70,215	81,537
Secured debt, estimated fair value	75,778	87,891
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	44,975	45,002
Level 3 | Residential collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	67,154	70,308
Secured debt, estimated fair value	63,957	66,865
Level 3 | Multi-family collateralized debt obligations
Financial Liabilities
Secured debt, carrying value	8,953,467	9,189,459
Secured debt, estimated fair value	8,953,467	9,189,459
Level 3 | Residential mortgage loans held in securitization trusts
Financial Assets:
Residential mortgage loans held in securitization trusts, net	70,864	73,820
Residential mortgage loans held in securitization trusts, net, estimated fair value	70,334	72,131
Level 3 | Distressed residential mortgage loans
Financial Assets:
Residential mortgage loans held in securitization trusts, net	322,072	331,464
Residential mortgage loans held in securitization trusts, net, estimated fair value	325,597	334,765
Level 3 | Residential mortgage loans, at fair value
Financial Assets:
Residential mortgage loans held in securitization trusts, net	99,480	87,153
Residential mortgage loans held in securitization trusts, net, estimated fair value	99,480	87,153
Level 3 | Multi-family loans held in securitization trusts
Financial Assets:
Residential mortgage loans held in securitization trusts, net	9,438,309	9,657,421
Residential mortgage loans held in securitization trusts, net, estimated fair value	9,438,309	9,657,421
Level 2
Financial Assets:
Derivative assets	9,815	846
Financial Liabilities
Convertible notes, carrying value	129,242	128,749
Convertible notes, estimated fair value	138,911	140,060
Level 2 | Portfolio Investments
Financial Liabilities
Financing arrangements	1,287,314	1,276,918
Level 2 | Distressed residential mortgage loans
Financial Liabilities
Financing arrangements	$ 149,049	$ 149,063

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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 942
-SubTopic 210
-Section S99
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