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Borrowings - Schedule of Outstanding Principal and Fair Value of Financial Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Outstanding Principal				$ 267,479
Fair Value				264,096
September 30, 2025
Debt Instrument [Line Items]
Outstanding Principal	$ 324,611
Fair Value	318,325
Level 3
Debt Instrument [Line Items]
Fair Value				264,096
Level 3 | September 30, 2025
Debt Instrument [Line Items]
Fair Value	318,325
4.875% Notes Due 2026
Debt Instrument [Line Items]
Outstanding Principal				108,000
Fair Value				103,820
4.875% Notes Due 2026 | September 30, 2025
Debt Instrument [Line Items]
Outstanding Principal	108,000
Fair Value	103,820
4.875% Notes Due 2026 | Level 3
Debt Instrument [Line Items]
Fair Value				103,820
4.875% Notes Due 2026 | Level 3 | September 30, 2025
Debt Instrument [Line Items]
Fair Value	103,820
2026 Notes
Debt Instrument [Line Items]
Outstanding Principal	50,000
2026 Notes | September 30, 2025
Debt Instrument [Line Items]
Outstanding Principal	50,000
Fair Value	47,375
2026 Notes | Level 3 | September 30, 2025
Debt Instrument [Line Items]
Fair Value	47,375
2032 Convertible Notes
Debt Instrument [Line Items]
Outstanding Principal	2,500
2032 Convertible Notes | September 30, 2025
Debt Instrument [Line Items]
Outstanding Principal	2,500
Fair Value	2,365
2032 Convertible Notes | Level 3 | September 30, 2025
Debt Instrument [Line Items]
Fair Value	2,365
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding Principal	130,779	$ 147,379	$ 147,379	159,479	$ 92,000	$ 92,000	$ 80,571	$ 49,321	$ 79,571
Fair Value				160,276
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | September 30, 2025
Debt Instrument [Line Items]
Outstanding Principal	130,779
Fair Value	131,433
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level 3
Debt Instrument [Line Items]
Fair Value				$ 160,276
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level 3 | September 30, 2025
Debt Instrument [Line Items]
Fair Value	131,433
KeyBank Credit Facility
Debt Instrument [Line Items]
Outstanding Principal	33,332
KeyBank Credit Facility | September 30, 2025
Debt Instrument [Line Items]
Outstanding Principal	33,332
Fair Value	33,332
KeyBank Credit Facility | Level 3 | September 30, 2025
Debt Instrument [Line Items]
Fair Value	$ 33,332

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