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Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Capital
Retained Earnings
Accumulated  Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2024   5,173,000        
Beginning balance at Dec. 31, 2024 $ 176,859 $ 5,173 $ 34,765 $ 133,402 $ 3,887 $ (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 18,432     18,432    
Dividends paid (46,202)     (46,202)    
Change in fair value of interest rate derivatives (4,036)       (4,036)  
Deferred stock unit grants 394   394      
Ending balance (in shares) at Jun. 30, 2025   5,173,000        
Ending balance at Jun. 30, 2025 $ 145,447 $ 5,173 35,159 105,632 (149) (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends per common share (in usd per share) $ 9.00          
Beginning balance (in shares) at Mar. 31, 2025   5,173,000        
Beginning balance at Mar. 31, 2025 $ 163,089 $ 5,173 34,765 122,613 906 (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 6,120     6,120    
Dividends paid (23,101)     (23,101)    
Change in fair value of interest rate derivatives (1,055)       (1,055)  
Deferred stock unit grants 394   394      
Ending balance (in shares) at Jun. 30, 2025   5,173,000        
Ending balance at Jun. 30, 2025 $ 145,447 $ 5,173 35,159 105,632 (149) (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends per common share (in usd per share) $ 4.50          
Beginning balance (in shares) at Dec. 31, 2025 5,173,450 5,173,000        
Beginning balance at Dec. 31, 2025 $ 109,156 $ 5,173 35,159 69,201 (9) (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 160,024     160,024    
Dividends paid (46,224)     (46,224)    
Change in fair value of interest rate derivatives 11       11  
Deferred stock unit grants $ 656   656      
Ending balance (in shares) at Jun. 30, 2026 5,173,450 5,173,000        
Ending balance at Jun. 30, 2026 $ 223,623 $ 5,173 35,815 183,001 2 (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends per common share (in usd per share) $ 9.00          
Beginning balance (in shares) at Mar. 31, 2026   5,173,000        
Beginning balance at Mar. 31, 2026 $ 90,724 $ 5,173 35,159 50,751 9 (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 155,362     155,362    
Dividends paid (23,112)     (23,112)    
Change in fair value of interest rate derivatives (7)       (7)  
Deferred stock unit grants $ 656   656      
Ending balance (in shares) at Jun. 30, 2026 5,173,450 5,173,000        
Ending balance at Jun. 30, 2026 $ 223,623 $ 5,173 $ 35,815 $ 183,001 $ 2 $ (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends per common share (in usd per share) $ 4.50