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Financing Arrangements, Portfolio Investments - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) counterparty	Dec. 31, 2017 USD ($) counterparty	Mar. 31, 2017 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average days to maturity	55 days	44 days
Interest payable	$ 3,100	$ 2,500
Advance rate	90.00%
Average haircut	10.00%
Repurchase agreements, number of counterparties | counterparty	10
Cash and cash equivalents	$ 65,495	$ 95,191	$ 73,033
Unencumbered investment securities	$ 300,500
Liquidation proceeds, percentage	28.40%
Lender Concentration Risk | Stockholders' Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreements, number of counterparties | counterparty		11
Concentration risk, percentage	6.20%	5.00%
CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	24.00%
Unencumbered investment securities	$ 75,600
Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	5.00%	5.00%
Non-Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	25.00%
Unencumbered investment securities	$ 50,000
Residential Mortgage Backed Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unencumbered investment securities	174,900
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreement, amount outstanding	$ 1,300,000	$ 1,300,000
Weighted average interest rate	2.51%	2.18%

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Number of counterparties the entity has repurchase agreements with.

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Represents the amount of unencumbered investment securities available to meet additional haircut or market valuation requirements.

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Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: 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)(i)(A)(ii))
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Weighted average interest rate of debt outstanding.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Indicates, if estimable, (as a percentage) the approximate extent to which the proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee or each group of similar guarantees.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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