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Commitments and Contingencies, Contractual Commitments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Agency Business Commitments
Cash collateral	$ 202,736	$ 139,398
Debt Obligations
Remainder of 2018	565,900
2019	356,200
2020	972,000,000
2021	872,300
2022	244,200
Thereafter	401,400
Unfunded CLO Commitments
Unfunded commitments related to structured loans and investments	68,600
Cash collateral arrangement - purchase and loss obligations under Freddie Mac's SBL Program
Agency Business Commitments
Cash collateral per securitization	5,000
Outstanding letters of credit	$ 5,000
Forward Contracts
Agency Business Commitments
Period of contractual commitment	60 days
Fannie Mae
Agency Business Commitments
Minimum liquid assets to be maintained to meet operational liquidity requirements	$ 12,900
Period of funding for collateral requirement	48 months
Fannie Mae | Restricted liquidity arrangement - loans sold under the Fannie Mae DUS program
Agency Business Commitments
Letter of credit assigned	$ 44,000
Reserve required to fund additional restricted liquidity over the next 48 months	$ 29,700
Period of additional funding for collateral requirement	48 months

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Required amount of cash collateral held for each securitization.

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The minimum liquid assets required to be maintained by the entity to meet operational liquidity requirements as of the balance sheet date.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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