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Financing Arrangements, Portfolio Investments - Narrative (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) counterparty	Dec. 31, 2017 USD ($) counterparty	Jun. 30, 2017 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average days to maturity	57 days	44 days
Interest payable	$ 4,200	$ 2,500
Advance rate	90.20%
Average haircut	9.80%
Repurchase agreements, number of counterparties | counterparty	9	10
Cash and cash equivalents	$ 84,717	$ 95,191	$ 75,391
Unencumbered investment securities	$ 318,000
Liquidation proceeds, percentage	34.10%
Lender Concentration Risk | Stockholders' Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreements, number of counterparties | counterparty		10
Concentration risk, percentage		5.00%
Deutsche Bank AG, London Branch | Lender Concentration Risk | Stockholders' Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Concentration risk, percentage	6.80%
Jefferies And Company, Inc | Lender Concentration Risk | Stockholders' Equity
Financial Instruments Owned and Pledged as Collateral [Line Items]
Concentration risk, percentage	5.20%
CMBS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Average haircut	25.00%
Unencumbered investment securities	$ 98,800
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	$ 42,200
Residential Mortgage Backed Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unencumbered investment securities	177,000
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Repurchase agreement, amount outstanding	$ 1,200,000	$ 1,300,000
Weighted average interest rate	2.76%	2.18%

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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.

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