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Borrowings - Components of Interest Expense and Related Fees (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Series A Notes      
Line Of Credit Facility [Line Items]      
Stated interest expense $ 1,861    
Amortization of deferred financing costs 81    
Total interest and amortization of deferred financing costs $ 1,942    
Weighted average effective interest rate 7.90%    
Weighted average outstanding balance $ 24,529    
2025 Notes      
Line Of Credit Facility [Line Items]      
Stated interest expense 11,468 $ 12,775 $ 10,527
Amortization of deferred financing costs 1,948 1,990 1,584
Total interest and amortization of deferred financing costs $ 13,416 $ 14,765 $ 12,111
Weighted average effective interest rate 8.20% 8.10% 8.00%
Weighted average outstanding balance $ 163,730 $ 182,500 $ 150,575
6.00% Convertible Notes due 2025      
Line Of Credit Facility [Line Items]      
Stated interest expense 3,000 3,000 3,000
Amortization of deferred financing costs $ 645 $ 639 $ 639
Weighted average effective interest rate 7.30% 7.30% 7.30%
Weighted average outstanding balance $ 50,000 $ 50,000 $ 50,000
Total interest and amortization of deferred financing costs and original issue discount 3,645 3,639 3,639
August 2026 Notes      
Line Of Credit Facility [Line Items]      
Stated interest expense 5,469 5,469 5,453
Amortization of deferred financing costs 582 577 577
Total interest and amortization of deferred financing costs $ 6,051 $ 6,046 $ 6,030
Weighted average effective interest rate 4.80% 4.80% 4.80%
Weighted average outstanding balance $ 125,000 $ 125,000 $ 125,000
December 2026 Notes      
Line Of Credit Facility [Line Items]      
Stated interest expense 3,188 3,188 3,188
Amortization of deferred financing costs 379 373 372
Total interest and amortization of deferred financing costs $ 3,567 $ 3,561 $ 3,560
Weighted average effective interest rate 4.80% 4.70% 4.70%
Weighted average outstanding balance $ 75,000 $ 75,000 $ 75,000
March 2029 Notes      
Line Of Credit Facility [Line Items]      
Stated interest expense 6,868    
Amortization of deferred financing costs 511    
Total interest and amortization of deferred financing costs $ 7,379    
Weighted average effective interest rate 8.40%    
Weighted average outstanding balance $ 87,350    
September 2029 Notes      
Line Of Credit Facility [Line Items]      
Stated interest expense 4,075    
Amortization of deferred financing costs 320    
Total interest and amortization of deferred financing costs $ 4,395    
Weighted average effective interest rate 8.50%    
Weighted average outstanding balance $ 51,844    
KeyBank Credit Facility      
Line Of Credit Facility [Line Items]      
Stated interest expense 20,492 15,468 8,033
Amortization of deferred financing costs 1,061 817 766
Total interest and amortization of deferred financing costs $ 21,553 $ 16,285 $ 8,799
Weighted average effective interest rate 9.10% 9.00% 5.90%
Weighted average outstanding balance $ 235,705 $ 180,399 $ 149,911