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Debt Obligations, Luxembourg Debt Fund (Details) - USD ($) $ in Thousands	1 Months Ended
	Nov. 30, 2017	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Debt Obligations
Debt, Carrying Value		$ 1,592,089		$ 1,418,422
Weighted Average Note Rate (as a percent)		4.10%		3.34%
Luxembourg debt fund
Debt Obligations
Value of portfolio loans as collateral	$ 100,000
Debt, Face Value	$ 70,000	$ 70,000		$ 70,000
Debt, Carrying Value		$ 68,099		$ 68,084
Weighted Average Note Rate (as a percent)		6.50%		5.79%
Collateral Loans, UPB		$ 98,696		$ 96,995
Collateral Loans, Carrying Value		98,261		96,564
Cash collateral				3,005
Deferred financing fees		$ 1,900		$ 1,900
Weighted average note rate including certain fees and costs (as a percent)		7.08%		6.05%
Collateral at risk			$ 0	$ 0
One-month LIBOR | Luxembourg debt fund
Debt Obligations
Variable rate, spread (as a percent)	4.15%
Luxembourg commercial real estate debt fund
Debt Obligations
Equity formed	$ 100,000
Equity interest retained	$ 30,000
Reinvested period allowed	3 years

X

- Definition

Represents the face value of collateral in default, as defined by the CDO indenture, as well as assets deemed to be a credit risk. Credit risk assets are reported by each of the CDOs and are generally defined as the one that, in the CDO collateral manager's reasonable business judgment, has a significant risk of declining in credit quality or, with a passage of time, becoming a defaulted asset.

+ References

No definition available.

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- Definition

Represents the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding, including certain fees and costs.

+ References

No definition available.

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- Definition

Represents the carrying value of the mortgage loans that serve as collateral.

+ References

No definition available.

+ Details

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- Definition

Represents the unpaid principal balance of the mortgage loans that serve as collateral.

+ References

No definition available.

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- Definition

Equity interest of the Variable Interest Entity's (VIE) voting interest formed by the reporting entity (directly or indirectly).

+ References

No definition available.

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- Definition

Equity interest of the Variable Interest Entity's (VIE) voting interest retained by the reporting entity (directly or indirectly).

+ References

No definition available.

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- Definition

Reinvested period allowed for principal proceeds from portfolio assets of the Variable Interest Entity's (VIE) to be reinvested in qualifying replacement assets, subject to certain conditions.

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount of assets pledged to secure a debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

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.

+ References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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