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Financing Arrangements, Portfolio Investments - Assets Pledged as Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | $ 608,304 | $ 773,142
Fair Value of Collateral Pledged | 731,855 | 945,143
Amortized Cost of Collateral Pledged | 689,722 | 889,327
Consolidated K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
K-Series, carrying value | 408,700 | 314,900
Agency ARMs |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 80,327 | 102,088
Fair Value of Collateral Pledged | 85,117 | 109,552
Amortized Cost of Collateral Pledged | 85,990 | 110,903
Agency Fixed Rate |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 248,936 | 289,619
Fair Value of Collateral Pledged | 261,450 | 308,411
Amortized Cost of Collateral Pledged | 270,587 | 318,544
Agency IOs/U.S. Treasury Securities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 26,048 | 60,862
Fair Value of Collateral Pledged | 36,702 | 82,153
Amortized Cost of Collateral Pledged | 47,913 | 93,819
Non Agency |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 48,773 | 113,749
Fair Value of Collateral Pledged | 64,917 | 150,944
Amortized Cost of Collateral Pledged | 63,792 | 149,969
CMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 204,220 | 206,824
Fair Value of Collateral Pledged | 283,669 | 294,083
Amortized Cost of Collateral Pledged | 221,440 | 216,092
CMBS | Consolidated K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
K-Series, carrying value | $ 237,800 | $ 254,600

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- Definition Represents the aggregate carrying value of the investment in the multi-family loans held in securitization trusts. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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