v3.26.1
Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance as of beginning of period (in shares)   89,834,849     89,834,849  
Balance as of beginning of period $ 3,093,644 $ 2,993,893 $ 2,840,133 $ 2,797,838 $ 2,993,893 $ 2,797,838
Public offering of common stock, net of offering costs 18,871 134,283 10,833 5,198    
Share‑based compensation 5,807 5,105 5,416 4,842    
Purchase of vested stock for employee payroll tax withholding (8,974)   (10,015)      
Dividend reinvestment (in shares)         376,928 324,454
Dividend reinvestment 10,647 9,961 9,379 9,087 $ 20,608 $ 18,466
Amortization of directors’ deferred compensation 86 90 97 108    
Issuance of restricted stock, net of forfeited shares 0   0      
Net increase in net assets resulting from operations 147,577 48,981 122,534 116,082 $ 196,558 238,616
Dividends to stockholders $ (101,120) (98,669) (94,160) (93,022)    
Balance as of ending of period (in shares) 93,354,166       93,354,166  
Balance as of ending of period $ 3,166,538 $ 3,093,644 $ 2,884,217 $ 2,840,133 $ 3,166,538 $ 2,884,217
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance as of beginning of period (in shares) 92,462,273 89,838,001 88,659,597 88,400,391 89,838,001 88,400,391
Balance as of beginning of period $ 925 $ 898 $ 887 $ 884 $ 898 $ 884
Public offering of common stock, net of offering costs (in shares) 364,392 2,430,825 195,454 89,091    
Public offering of common stock, net of offering costs $ 4 $ 25 $ 2 $ 1    
Purchase of vested stock for employee payroll tax withholding (in shares) (169,445)   (177,024)      
Purchase of vested stock for employee payroll tax withholding $ (2)   $ (2)      
Dividend reinvestment (in shares) 203,405 173,523 167,705 156,749    
Dividend reinvestment $ 2 $ 2 $ 2 $ 2    
Issuance of restricted stock, net of forfeited shares (in shares) 498,700 19,924 436,863 13,366    
Issuance of restricted stock, net of forfeited shares $ 5   $ 4      
Balance as of ending of period (in shares) 93,359,325 92,462,273 89,282,595 88,659,597 93,359,325 89,282,595
Balance as of ending of period $ 934 $ 925 $ 893 $ 887 $ 934 $ 893
Additional Paid-In Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance as of beginning of period 2,607,285 2,457,660 2,413,914 2,394,492 2,457,660 2,394,492
Public offering of common stock, net of offering costs 18,867 134,258 10,831 5,197    
Share‑based compensation 5,807 5,105 5,416 4,842    
Purchase of vested stock for employee payroll tax withholding (8,972)   (10,013)      
Dividend reinvestment 10,645 9,959 9,377 9,085    
Amortization of directors’ deferred compensation 86 90 97 108    
Issuance of restricted stock, net of forfeited shares (5)   (4)      
Dividends to stockholders 222 213 199 190    
Balance as of ending of period 2,633,935 2,607,285 2,429,817 2,413,914 2,633,935 2,429,817
Total Undistributed Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Balance as of beginning of period 485,434 535,335 425,332 402,462 535,335 402,462
Net increase in net assets resulting from operations 147,577 48,981 122,534 116,082    
Dividends to stockholders (101,342) (98,882) (94,359) (93,212)    
Balance as of ending of period $ 531,669 $ 485,434 $ 453,507 $ 425,332 $ 531,669 $ 453,507