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Financing Arrangements - Narrative (Details) $ in Thousands														4 Months Ended	5 Months Ended
	Apr. 14, 2023 USD ($)	Mar. 07, 2023 USD ($)	Feb. 28, 2023 USD ($)	Apr. 27, 2022 USD ($)	Apr. 14, 2022 USD ($)	Mar. 28, 2022 USD ($)	Aug. 20, 2021 USD ($)	Feb. 11, 2021 USD ($)	Dec. 17, 2020 USD ($)	Nov. 09, 2020	May 15, 2020 USD ($)	May 19, 2017 USD ($) d subsidiary	Aug. 26, 2016 USD ($)	Apr. 02, 2018 USD ($)	Dec. 14, 2021 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Jul. 01, 2021 USD ($)	Feb. 26, 2021 USD ($)	Dec. 31, 2020 USD ($)	May 19, 2020 USD ($)	May 23, 2018 USD ($)	Dec. 01, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Principal amount																$ 1,010,712
Deferred financing costs, net																8,316	$ 6,178
Long-term debt																1,002,396	951,322
Total assets																1,854,492	1,872,411
Murray Hill Funding II
Line of Credit Facility [Line Items]
Total assets																252,595
JPM Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt													$ 57,000
2026 Notes | Unsecured debt
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt								$ 122,300
Debt issuance costs																2,669
Deferred financing costs, net																1,531
Debt instrument, aggregate principal amount								$ 125,000
Interest rate								4.50%
Debt instrument, redemption, minimum threshold percentage								10.00%
Net cash proceeds sale of certain equity interests								50.00%
Minimum shareholders' equity, percentage of net asset value								60.00%
Minimum asset coverage ratio								150.00%
Minimum interest coverage ratio								1.25
Unencumbered asset coverage ratio								1.25
Percentage of secured loans and cash of total unencumbered assets								65.00%
Percentage of equity interests of total unencumbered assets								15.00%
Unsecured credit facilities, loans or indebtedness in excess								$ 25,000
Minimum threshold of principal amount subject to evens of default								$ 25,000
Long-term debt																125,000
2026 Notes | Unsecured debt | On Or Before February 11, 2024
Line of Credit Facility [Line Items]
Redemption discount, percentage								0.50%
Debt instrument, redemption price, percentage of principal amount redeemed								100.00%
2026 Notes | Unsecured debt | On Or Before February 11, 2025
Line of Credit Facility [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed								102.00%
2026 Notes | Unsecured debt | After February 11, 2025 But On Or Before August 11, 2025
Line of Credit Facility [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed								101.00%
2026 Notes | Unsecured debt | After August 11, 2025
Line of Credit Facility [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed								100.00%
UBS Facility
Line of Credit Facility [Line Items]
Debt instrument, aggregate principal amount												$ 125,000		$ 200,000
Long-term debt																125,000					$ 133,333
Number of financing subsidiaries | subsidiary												2
Debt instrument, redemption price, percentage of principal amount redeemed												65.00%		75.00%
Debt instrument, repurchased face amount																						$ 133,333
Debt instrument, repurchase amount																					$ 100,000	$ 100,000
Repayments of debt, percentage																						50.00%
Percentage of initial market value									10.00%
UBS Facility | Murray Hill Funding II
Line of Credit Facility [Line Items]
Debt issuance costs									$ 2,637
Debt instrument, aggregate principal amount												$ 192,308												$ 266,667
Number of business days to cure payment failure | d												3
UBS Facility | LIBOR
Line of Credit Facility [Line Items]
Rate									3.375%	3.90%		3.50%
A-R Notes
Line of Credit Facility [Line Items]
Repayments of long-term debt		$ 17,500					$ 21,000
Debt instrument, redemption price, percentage of principal amount redeemed															100.00%
Debt instrument, repurchased face amount		17,500					21,000
Debt instrument, repurchase amount		$ 17,500					$ 21,000
A-R Notes | Subsequent Event
Line of Credit Facility [Line Items]
Repayments of long-term debt	$ 25
Debt instrument, repurchased face amount	25
Debt instrument, repurchase amount	$ 25
Series A Notes
Line of Credit Facility [Line Items]
Principal amount																80,712
Proceeds from issuance of long-term debt			$ 77,900
Debt instrument, aggregate principal amount			$ 80,712
Minimum asset coverage ratio			150.00%
Unencumbered asset coverage ratio			1.25
Long-term debt			$ 50
Minimum shareholders' equity, amount of net asset value			$ 525,000
Series A Notes | Secured Overnight Financing Rate
Line of Credit Facility [Line Items]
Rate			3.82%
2022 More Term Loan
Line of Credit Facility [Line Items]
Principal amount																50,000
Proceeds from issuance of long-term debt				$ 49,000
2022 More Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Debt issuance costs																1,025
Deferred financing costs, net																834
Debt instrument, aggregate principal amount				$ 50,000
Net cash proceeds sale of certain equity interests				50.00%
Minimum shareholders' equity, percentage of net asset value				60.00%
Minimum asset coverage ratio				150.00%
Unencumbered asset coverage ratio				1.25
Percentage of secured loans and cash of total unencumbered assets				65.00%
Percentage of equity interests of total unencumbered assets				15.00%
Minimum threshold of principal amount subject to evens of default				$ 25,000
Long-term debt																		$ 50,000
2022 More Term Loan | SOFR | Unsecured debt
Line of Credit Facility [Line Items]
Rate				3.50%
Debt instrument, basis spread on prepayment fee				2.00%
2022 More Term Loan | SOFR Floor Rate | Unsecured debt
Line of Credit Facility [Line Items]
Rate				1.00%
2021 More Term Loan
Line of Credit Facility [Line Items]
Principal amount																30,000
2021 More Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt					$ 29,000
Debt issuance costs																992
Deferred financing costs, net																425
Debt instrument, aggregate principal amount					$ 30,000
Interest rate					5.20%
Net cash proceeds sale of certain equity interests					50.00%
Minimum shareholders' equity, percentage of net asset value					60.00%
Minimum asset coverage ratio					150.00%
Unencumbered asset coverage ratio					1.25
Percentage of secured loans and cash of total unencumbered assets					65.00%
Percentage of equity interests of total unencumbered assets					15.00%
Minimum threshold of principal amount subject to evens of default					$ 25,000
Long-term debt					$ 30,000
Debt instrument, basis spread on prepayment fee					2.00%
Secured Debt | JPM Credit Facility
Line of Credit Facility [Line Items]
Prepayment premium percentage						1.00%
Unused fee percentage						1.00%
Long-term line of credit																$ 600,000	$ 610,000
Membership interest exchange percentage																100.00%
Debt issuance costs																$ 12,102
Deferred financing costs, net																2,571
Secured Debt | JPM Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Principal amount						$ 675,000					$ 700,000		150,000							$ 575,000			$ 275,000			$ 225,000
Line of credit facility, additional advances amount						$ 100,000
Secured Debt | JPM Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Rate						0.15%					3.25%
Secured Debt | UBS Facility
Line of Credit Facility [Line Items]
Repayments of long-term debt											$ 100,000
Secured Debt | Series A Notes
Line of Credit Facility [Line Items]
Debt issuance costs																3,033
Deferred financing costs, net																$ 2,955
Revolving Credit Facility | JPM Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Principal amount											$ 75,000		$ 25,000										$ 25,000		$ 25,000
Revolving Credit Facility | A-R Notes
Line of Credit Facility [Line Items]
Principal amount									$ 50,000
Unused fee percentage									0.75%
Debt instrument, repurchased face amount															$ 25,000			$ 17,500	$ 21,000
Debt instrument, face amount that may be issued									$ 150,000
Revolving Credit Facility | A-R Notes | LIBOR
Line of Credit Facility [Line Items]
Rate									3.375%

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