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Interim Financial Statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 05, 2025
Oct. 31, 2023
Dividends payable, amount per share         $ 0.125  
Purchase of treasury shares (in shares) 0   330,441      
Purchase of treasury shares   $ 35,335 $ 13,814 $ 68,273    
Net income $ 28,554 $ 23,603 $ 80,648 $ 79,671    
Earnings per share - basic $ 0.48 $ 0.39 $ 1.34 $ 1.31    
Earnings per share - diluted $ 0.47 $ 0.39 $ 1.34 $ 1.3    
Transportation Equipment [Member]            
Property and equipment estimated life 25 years   25 years      
Computer Equipment and Software [Member]            
Depreciation $ 2,100   $ 4,500      
Net income $ 1,600   $ 3,400      
Earnings per share - basic $ 0.03   $ 0.06      
Earnings per share - diluted $ 0.03   $ 0.06      
Computer Equipment and Software [Member] | Minimum [Member]            
Property and equipment estimated life 7 years   7 years      
Computer Equipment and Software [Member] | Maximum [Member]            
Property and equipment estimated life 10 years   10 years      
Class A Common Stock [Member] | 2023 Share Repurchase Program [Member]            
Stock repurchase program, authorized amount           $ 250,000