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Financing Arrangements, Portfolio Investments - Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) counterparty	Dec. 31, 2016 USD ($) counterparty
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average days to maturity	18 days	12 days
Interest payable	$ 500	$ 1,100
Advance rate	87.80%
Average haircut	12.20%
Repurchase agreements, number of counterparties | counterparty	8
Cash and cash equivalents	$ 101,904	$ 83,554
Unencumbered investment securities	$ 243,100
Liquidation proceeds, percentage	58.20%
Held in Agency IO Portfolio for Trading Purposes
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unencumbered investment securities	$ 8,900
Lender Concentration Risk | Stockholders' Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreements, number of counterparties | counterparty	0	0
Concentration risk, percentage		5.10%
Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	4.00%	5.00%
Non-Agency RMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	25.00%
Unencumbered investment securities	$ 68,100
CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	20.00%
Unencumbered investment securities	$ 139,900
Agency IOs
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	25.00%
Residential Mortgage Backed Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unencumbered investment securities	$ 35,100
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreement, amount outstanding	$ 608,300	$ 773,100
Weighted average interest rate	2.33%	1.92%

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Number of counterparties the entity has repurchase agreements with.

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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
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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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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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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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