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Debt Obligations, Collateralized Loan Obligations (Details)	1 Months Ended		3 Months Ended	9 Months Ended
	Aug. 31, 2017 USD ($) subsidiary tranche	Apr. 30, 2017 USD ($) subsidiary tranche	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Obligations
Debt, Carrying Value			$ 1,066,230,488	$ 1,066,230,488	$ 728,441,109
Weighted average note rate (as a percent)			2.99%	2.99%	2.25%
Outstanding notes repaid				$ 219,000,000
CLOs
Debt Obligations
Debt, Carrying Value			$ 1,066,230,488	1,066,230,488	$ 728,441,109
Debt, Face Value			$ 1,079,874,000	$ 1,079,874,000	$ 737,000,000
Weighted average note rate (as a percent)			3.32%	3.32%	3.21%
Collateral Loans, Unpaid Principal			$ 1,254,803,220	$ 1,254,803,220	$ 960,567,514
Collateral Loans, Carrying Value			1,249,875,599	1,249,875,599	957,527,517
Cash collateral			134,196,781	134,196,781	14,432,488
Deferred financing fees			13,600,000	13,600,000	8,600,000
Collateral at risk			$ 0	$ 0	$ 0
Weighted average note rate including certain fees and costs (as a percent)			3.88%	3.88%	3.71%
CLO VIII
Debt Obligations
Number of investment grade tranches issued | tranche	6
Number of newly-formed wholly-owned subsidiaries | subsidiary	2
Debt, Carrying Value	$ 312,100,000		$ 278,296,193	$ 278,296,193
Debt, Face Value	365,000,000		$ 282,874,000	$ 282,874,000
Value of portfolio loans as collateral	$ 293,700,000
Weighted average note rate (as a percent)			2.58%	2.58%
Collateral Loans, Unpaid Principal			$ 324,190,963	$ 324,190,963
Collateral Loans, Carrying Value			322,527,190	322,527,190
Cash collateral			40,809,037	40,809,037
Replacement period	3 years
Proceeds from issuance of securities for the purpose of acquiring additional loan obligations	$ 71,300,000
Notional amount of residual interest retained	$ 82,100,000
CLO VIII | One-month LIBOR
Debt Obligations
Weighted average note rate (as a percent)	1.31%
CLO VIII | Investment grade
Debt Obligations
Debt, Carrying Value	$ 282,900,000
CLO VIII | Below investment grade
Debt Obligations
Debt, Carrying Value	$ 29,200,000
CLO VII
Debt Obligations
Number of newly-formed wholly-owned subsidiaries | subsidiary		2
Debt, Carrying Value		$ 279,000,000	275,035,774	275,035,774
Debt, Face Value		$ 360,000,000	$ 279,000,000	$ 279,000,000
Weighted average note rate (as a percent)		1.99%	3.27%	3.27%
Collateral Loans, Unpaid Principal			$ 313,857,643	$ 313,857,643
Collateral Loans, Carrying Value			312,693,431	312,693,431
Cash collateral			35,142,358	35,142,358
Replacement period		3 years
Proceeds from issuance of securities for the purpose of acquiring additional loan obligations		$ 63,800,000
Maximum period to acquire additional loan obligations		120 days
Notional amount of residual interest retained		$ 81,000,000
CLO VII | Investment grade
Debt Obligations
Number of investment grade tranches issued | tranche		3
CLO VII | Secured Debt
Debt Obligations
Value of portfolio loans as collateral		$ 296,200,000
CLO VI
Debt Obligations
Debt, Carrying Value			247,207,545	247,207,545	$ 246,442,883
Debt, Face Value			$ 250,250,000	$ 250,250,000	$ 250,250,000
Weighted average note rate (as a percent)			3.76%	3.76%	3.30%
Collateral Loans, Unpaid Principal			$ 303,821,532	$ 303,821,532	$ 324,569,105
Collateral Loans, Carrying Value			302,750,497	302,750,497	323,350,928
Cash collateral			21,178,468	21,178,468	430,895
CLO V
Debt Obligations
Debt, Carrying Value			265,690,976	265,690,976	264,864,114
Debt, Face Value			$ 267,750,000	$ 267,750,000	$ 267,750,000
Weighted average note rate (as a percent)			3.72%	3.72%	3.26%
Collateral Loans, Unpaid Principal			$ 312,933,082	$ 312,933,082	$ 344,679,286
Collateral Loans, Carrying Value			311,904,481	311,904,481	343,747,570
Cash collateral			37,066,918	37,066,918	5,320,715
CLO IV
Debt Obligations
Debt, Carrying Value					217,134,112
Debt, Face Value					$ 219,000,000
Weighted average note rate (as a percent)					3.06%
Collateral Loans, Unpaid Principal					$ 291,319,123
Collateral Loans, Carrying Value					290,429,019
Cash collateral					$ 8,680,878
Outstanding notes repaid			219,000,000
CLO IV | Interest expense
Debt Obligations
Deferred financing fees			$ 1,100,000	$ 1,100,000

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

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The cash inflow from amounts received from issuance of additional long-term debt that is wholly or partially secured by collateral.

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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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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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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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