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Debt Obligations, Collateralized Loan Obligations (Details) $ in Thousands		1 Months Ended	9 Months Ended
	Oct. 01, 2018 USD ($)	Jun. 30, 2018 USD ($) item tranche	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Obligations
Debt, Carrying Value			$ 1,592,089			$ 1,418,422
Weighted average note rate (as a percent)			4.10%			3.34%
Proceeds from issuance of collateralized loan obligations			$ 441,000	$ 561,874
CLOs
Debt Obligations
Debt, Face Value			1,609,524			$ 1,436,274
Debt, Carrying Value			$ 1,592,089			$ 1,418,422
Weighted average note rate (as a percent)			3.98%			3.48%
Collateral Loans, Unpaid Principal			$ 1,792,687			$ 1,745,891
Collateral Loans, Carrying Value			1,786,843			1,740,180
Cash collateral			169,579			115,109
Deferred financing fees			$ 17,400			$ 17,900
Weighted average note rate including certain fees and costs (as a percent)			4.49%			4.08%
Collateral at risk					$ 0	$ 0
CLO X
Debt Obligations
Number of tranches of CLO notes issued | tranche		7
Number of newly-formed wholly-owned subsidiaries | item		2
Value of the seven tranches issued		$ 494,200
Value of portfolio loans as collateral		$ 501,900
Debt, Face Value			$ 441,000
Debt, Carrying Value			$ 436,132
Weighted average note rate (as a percent)			3.76%
Collateral Loans, Unpaid Principal			$ 510,303
Collateral Loans, Carrying Value			508,357
Cash collateral			42,032
Replacement period		4 years
Proceeds from issuance of collateralized loan obligations		$ 58,100
Notional amount of residual interest retained		119,000
CLO X | Period of up to 120 days from the CLO closing date
Debt Obligations
Value of portfolio loans as collateral	$ 560,000
Maximum period to acquire additional loan obligations	120 days
Leverage (as a percent)	79.00%
CLO X | Investment grade
Debt Obligations
Debt, Face Value		441,000
CLO X | Below investment grade
Debt Obligations
Debt, Face Value		53,200
Notional amount of residual interest retained		$ 53,200
CLO X | Secured Debt | One-month LIBOR
Debt Obligations
Weighted average note rate (as a percent)		1.45%
CLO IX
Debt Obligations
Debt, Face Value			356,400			356,400
Debt, Carrying Value			$ 351,934			$ 351,042
Weighted average note rate (as a percent)			3.67%			2.97%
Collateral Loans, Unpaid Principal			$ 417,089			$ 372,350
Collateral Loans, Carrying Value			415,776			371,236
Cash collateral			3,911			88,650
CLO VIII
Debt Obligations
Debt, Face Value			282,874			282,874
Debt, Carrying Value			$ 279,538			$ 278,606
Weighted average note rate (as a percent)			3.62%			2.92%
Collateral Loans, Unpaid Principal			$ 304,078			$ 364,838
Collateral Loans, Carrying Value			303,302			363,339
Cash collateral			39,409			162
CLO VII
Debt Obligations
Debt, Face Value			279,000			279,000
Debt, Carrying Value			$ 276,221			$ 275,331
Weighted average note rate (as a percent)			4.31%			3.61%
Collateral Loans, Unpaid Principal			$ 285,134			$ 346,524
Collateral Loans, Carrying Value			284,322			345,220
Cash collateral			43,885			13,476
CLO VI
Debt Obligations
Debt, Face Value			250,250			250,250
Debt, Carrying Value			$ 248,264			$ 247,470
Weighted average note rate (as a percent)			4.81%			4.10%
Collateral Loans, Unpaid Principal			$ 276,083			$ 314,382
Collateral Loans, Carrying Value			275,086			313,582
Cash collateral			$ 40,342			10,618
CLO V
Debt Obligations
Debt, Face Value						267,750
Debt, Carrying Value						$ 265,973
Weighted average note rate (as a percent)						4.06%
Collateral Loans, Unpaid Principal						$ 347,797
Collateral Loans, Carrying Value						346,803
Cash collateral						$ 2,203
Debt Instrument Redemption Value		$ 267,800
Deferred fees expensed as interest expense		$ 1,300

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.

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Represents the replacement period of financing that allows the principal proceeds and sale proceeds (if any) of the loan obligations to be reinvested in qualifying replacement loan obligations.

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Maximum period of time to acquire additional loan obligations, from the closing date of the CLO.

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The cash inflow from amounts received from issuance of collateralized loan obligations. Secured long-term loans are wholly or partially secured by collateral.

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Notional amount of collateralized securitization vehicle residual interest retained.

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Amount of amortization expense attributable to debt issuance costs.

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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.

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Amount of assets pledged to secure a debt instrument.

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Weighted average interest rate of debt outstanding.

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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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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.

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