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Repurchase Agreements - Assets Pledged as Collateral (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Repurchase Agreements | $ 1,843,815 | $ 1,543,577
Fair Value of Collateral Pledged | 2,156,962 | 1,784,191
Amortized Cost of Collateral Pledged | 1,929,216 | 1,672,486
Consolidated K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
K-Series, carrying value | 801,200 | 657,600
Agency ARMs |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Repurchase Agreements | 58,802 | 67,648
Fair Value of Collateral Pledged | 62,295 | 70,747
Amortized Cost of Collateral Pledged | 64,004 | 73,290
Agency Fixed- Rate |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Repurchase Agreements | 812,811 | 857,582
Fair Value of Collateral Pledged | 858,359 | 907,610
Amortized Cost of Collateral Pledged | 863,160 | 940,994
Non-Agency RMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Repurchase Agreements | 172,108 | 88,730
Fair Value of Collateral Pledged | 234,583 | 117,958
Amortized Cost of Collateral Pledged | 232,657 | 118,414
CMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Repurchase Agreements | 800,094 | 529,617
Fair Value of Collateral Pledged | 1,001,725 | 687,876
Amortized Cost of Collateral Pledged | 769,395 | 539,788
CMBS | Consolidated K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
K-Series, carrying value | $ 755,300 | $ 543,000

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=109249958&loc=SL6224234-111729 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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