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Debt Obligations, Collateralized Loan Obligations (Details) $ in Thousands	1 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($) tranche	Jun. 30, 2019	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Obligations
Proceeds from issuance of collateralized loan obligations			$ 668,000	$ 533,000
Debt, Carrying Value			$ 2,514,524		$ 2,130,121
Weighted average note rate (as a percent)			2.49%		3.54%
Payoffs and paydowns of collateralized loan obligations			$ 282,874	$ 250,250
CLOs
Debt Obligations
Debt, Face Value			2,532,593		$ 2,147,467
Debt, Carrying Value			$ 2,514,524		$ 2,130,121
Weighted average note rate (as a percent)			1.62%		3.23%
Restricted cash related to interest payments, delayed fundings and expenses			$ 71,100		$ 58,600
Collateral Loans, Unpaid Principal			3,026,126		2,497,578
Collateral Loans, Carrying Value			3,014,756		2,487,391
Cash, Restricted Cash			18,937		118,411
Deferred financing fees			$ 18,100		$ 17,300
Weighted average note rate including certain fees and costs (as a percent)			1.97%		3.63%
Collateral at risk			$ 46,500		$ 0
CLO XIII
Debt Obligations
Number of tranches of CLO notes issued | tranche	8
Value of the tranches issued	$ 738,000
Debt, Face Value			668,000
Debt, Carrying Value			$ 663,209
Weighted average note rate (as a percent)			1.60%
Collateral Loans, Unpaid Principal			$ 760,567
Collateral Loans, Carrying Value			756,806
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations	159,500
Notional amount of residual interest retained	132,000
Value of portfolio loans as collateral	640,500
Face value of loan obligations will be owned by the issuer	$ 800,000
Leverage (as a percent)	84.00%
CLO XIII | One-month LIBOR
Debt Obligations
Weighted average note rate including certain fees and costs (as a percent)	1.41%
CLO XIII | Investment grade
Debt Obligations
Debt, Face Value	$ 668,000
CLO XIII | Below investment grade
Debt Obligations
Debt, Carrying Value	70,000
Notional amount of residual interest retained	70,000
CLO XII
Debt Obligations
Debt, Face Value			534,193		534,193
Debt, Carrying Value			$ 530,052		$ 529,448
Weighted average note rate (as a percent)			1.68%		3.30%
Collateral Loans, Unpaid Principal			$ 621,887		$ 596,366
Collateral Loans, Carrying Value			619,639		593,652
Cash, Restricted Cash					17,800
CLO XI
Debt Obligations
Debt, Face Value			533,000		533,000
Debt, Carrying Value			$ 529,258		$ 528,690
Weighted average note rate (as a percent)			1.63%		3.25%
Collateral Loans, Unpaid Principal			$ 641,273		$ 624,443
Collateral Loans, Carrying Value			639,020		621,508
Cash, Restricted Cash			4,632		15,550
Replacement period		3 years
Maximum period to acquire additional loan obligations		180 days
CLO X
Debt Obligations
Debt, Face Value			441,000		441,000
Debt, Carrying Value			$ 437,899		$ 437,391
Weighted average note rate (as a percent)			1.63%		3.26%
Collateral Loans, Unpaid Principal			$ 540,012		$ 509,887
Collateral Loans, Carrying Value			538,165		507,854
Cash, Restricted Cash			4,256		37,287
CLO IX
Debt Obligations
Debt, Face Value			356,400		356,400
Debt, Carrying Value			$ 354,106		$ 353,473
Weighted average note rate (as a percent)			1.55%		3.17%
Collateral Loans, Unpaid Principal			$ 462,387		$ 407,696
Collateral Loans, Carrying Value			461,126		406,463
Cash, Restricted Cash			$ 10,049		47,230
CLO VIII
Debt Obligations
Debt, Face Value					282,874
Debt, Carrying Value					$ 281,119
Weighted average note rate (as a percent)					3.12%
Collateral Loans, Unpaid Principal					$ 359,186
Collateral Loans, Carrying Value					357,914
Cash, Restricted Cash					$ 544
Payoffs and paydowns of collateralized loan obligations	282,900
Deferred fees expensed as interest expense	$ 1,500

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Amount of collateralized loan obligation.

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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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Face (par) amount of tranches issued to fund a collateralized securitization vehicle.

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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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Leverage capital divided by average loan and investment assets as defined in the agreements.

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

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

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Represents the number of tranches issued by the entity under collateralized debt obligations.

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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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The cash inflow from amounts received from issuance of collateralized loan obligations for the purpose of acquiring additional loan obligations.

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The cash outflow to repay the long term loans which 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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