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Financing Arrangements - Narrative (Details) $ in Thousands																			4 Months Ended	12 Months Ended
	Nov. 08, 2023 USD ($)	Oct. 10, 2023 USD ($)	Jun. 14, 2023	May 15, 2023 USD ($)	Apr. 14, 2023 USD ($)	Mar. 07, 2023 USD ($)	Feb. 28, 2023 USD ($)	Apr. 27, 2022 USD ($)	Mar. 28, 2022 USD ($)	Aug. 20, 2021 USD ($)	Apr. 14, 2021 USD ($)	Feb. 26, 2021 USD ($)	Feb. 11, 2021 USD ($)	Dec. 17, 2020 USD ($)	Nov. 09, 2020	May 15, 2020 USD ($)	May 19, 2017 USD ($) subsidiary d	Aug. 26, 2016 USD ($)	Apr. 02, 2018 USD ($)	Dec. 31, 2023 USD ($)	Aug. 16, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Dec. 14, 2021 USD ($)	Jul. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	May 19, 2020 USD ($)	May 23, 2018 USD ($)	Dec. 01, 2017 USD ($)	Sep. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Principal amount																				$ 1,092,344
Amount Available																				152,500
Deferred financing costs, net																				10,643		$ 6,178
Long-term debt																				1,081,701		951,322
Total assets																				2,001,724		1,872,411
Murray Hill Funding II
Line of Credit Facility [Line Items]
Total assets																				$ 252,001
JPM Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt																		$ 57,000
UBS Facility
Line of Credit Facility [Line Items]
Rate																				3.20%
Amount Available																				$ 27,500
Debt instrument, aggregate principal amount																	$ 125,000		$ 200,000
Debt instrument, redemption price, percentage of principal amount redeemed																	65.00%		75.00%
Long-term debt																				122,500						$ 133,333
Debt instrument, repurchased face amount																				122,500							$ 133,333
Debt instrument, repurchase amount																										$ 100,000	$ 100,000
Percentage of initial market value														10.00%
Number of financing subsidiaries | subsidiary																	2
UBS Facility | Murray Hill Funding II
Line of Credit Facility [Line Items]
Debt instrument, aggregate principal amount																	$ 192,308												$ 266,667
Number of business days to cure payment failure | d																	3
Debt issuance costs, gross														$ 2,637
UBS Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Rate														3.375%	3.90%		3.50%
UBS Facility | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Rate			3.525%
JPM Credit Facility, SOFR
Line of Credit Facility [Line Items]
Principal amount																				$ 550,000
Rate																				3.20%
Amount Available																				$ 125,000
JPM Credit Facility, SOFR | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Rate				3.05%					3.10%
2026 Notes
Line of Credit Facility [Line Items]
Amount Available																				0
Long-term debt																				125,000
2026 Notes | Unsecured debt
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt													$ 122,300
Debt instrument, aggregate principal amount													$ 125,000
Debt issuance costs, gross																				2,669
Deferred financing costs, net																				$ 1,129
Interest rate													4.50%							4.50%
Debt instrument, redemption, minimum threshold percentage													10.00%
Minimum shareholders' equity, amount of net asset value													$ 543,600
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, 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%
A-R Notes
Line of Credit Facility [Line Items]
Repayments of long-term debt					$ 25,000	$ 17,500				$ 21,000
Debt instrument, redemption price, percentage of principal amount redeemed																				100.00%
Debt instrument, repurchased face amount					25,000	17,500				21,000
Debt instrument, repurchase amount					$ 25,000	$ 17,500				$ 21,000
2022 More Term Loan
Line of Credit Facility [Line Items]
Principal amount																				$ 50,000
Proceeds from issuance of long-term debt								$ 49,000
Amount Available																				0
2022 More Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Debt instrument, aggregate principal amount								$ 50,000
Debt issuance costs, gross																				1,025
Deferred financing costs, net																				$ 680
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
Net cash proceeds sale of certain equity interests								50.00%
Minimum shareholders' equity, percentage of net asset value								60.00%
2022 More Term Loan | Secured Overnight Financing Rate (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
Amount Available																				0
2021 More Term Loan | Unsecured debt
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt											$ 29,000
Debt instrument, aggregate principal amount											$ 30,000
Debt issuance costs, gross																				992
Deferred financing costs, net																				$ 209
Interest rate																				5.20%
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%
Net cash proceeds sale of certain equity interests											50.00%
Minimum shareholders' equity, percentage of net asset value											60.00%
Senior Notes A
Line of Credit Facility [Line Items]
Principal amount																				$ 114,844
Proceeds from issuance of long-term debt							$ 77,900
Amount Available																				$ 0
Debt instrument, aggregate principal amount							80,712
Minimum shareholders' equity, amount of net asset value							$ 525,000
Minimum asset coverage ratio							150.00%
Unencumbered asset coverage ratio							1.25
Long-term debt							$ 50,000
Senior Notes A | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Rate																				3.82%
Series A Unsecured Notes Due 2026
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt		$ 32,317
Debt instrument, aggregate principal amount		$ 34,132
Deferred financing costs, net																				$ 5,139
Unamortized debt issuance costs																				4,253
2027 Notes
Line of Credit Facility [Line Items]
Principal amount																				100,000
Amount Available																				0
Minimum shareholders' equity, amount of net asset value	$ 543,600
2027 Notes | Unsecured debt
Line of Credit Facility [Line Items]
Proceeds from issuance of long-term debt	98,290
Debt instrument, aggregate principal amount	$ 100
Debt issuance costs, gross																				1,710
Interest rate	99.25%
Debt instrument, redemption, minimum threshold percentage	10.00%
Minimum asset coverage ratio	150.00%
Minimum interest coverage ratio	1.25
Unencumbered asset coverage ratio	1.25
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
Unamortized debt issuance costs																				$ 1,647
Minimum shareholders' equity, percentage of net asset value	65.00%
2027 Notes | Unsecured debt | On Or Before February 11, 2024
Line of Credit Facility [Line Items]
Redemption discount, percentage	0.50%
2027 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	100.00%
2027 Notes | Unsecured debt | After August 11, 2025
Line of Credit Facility [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed	100.00%
2027 Notes | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Rate	2.00%
2027 Notes | Secured Overnight Financing Rate (SOFR) | Unsecured debt
Line of Credit Facility [Line Items]
Rate																				4.75%
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																				$ 550,000		$ 610,000
Membership interest exchange percentage																				100.00%
Debt issuance costs, gross																				$ 13,790
Deferred financing costs, net																				$ 2,725
Secured Debt | JPM Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Principal amount				$ 675					$ 675,000			$ 575,000				$ 700,000		150,000										$ 275,000		$ 225,000
Line of credit facility, additional advances amount									$ 100,000
Line of credit facility, increase (decrease), net				50
Amount Available				$ 550
Secured Debt | JPM Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Rate									0.15%							3.25%
Secured Debt | JPM Credit Facility | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Rate				0.15%
Secured Debt | UBS Facility
Line of Credit Facility [Line Items]
Repayments of long-term debt																$ 100,000
Secured Debt | JPM Credit Facility, LIBOR | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Rate												3.10%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Rate			3.375%
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, face amount that may be issued														$ 150,000
Debt instrument, repurchased face amount																					$ 22,500		$ 17,500	$ 25,000	$ 21,000
Revolving Credit Facility | A-R Notes | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Rate														3.375%

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