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Consolidated Statement of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Shares [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Shares [Member]
Shares Outstanding, Beginning Balance at Dec. 31, 2020   28,813,849      
Stockholders' Equity, Beginning Balance at Dec. 31, 2020 $ 1,258,698 $ 301 $ 339,001 $ 948,453 $ (29,057)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 396,868     396,868  
Treasury Stock, Shares, Acquired   (842,500)      
Treasury Stock, Value, Acquired, Cost Method (51,520)       (51,520)
Stock options exercised - shares   452,100      
Stock options exercised - value 11,241   1,227   10,014
Stock-based compensation expense 8,559   8,559    
Deferral of Executive and Director Compensation 338   338    
Deferred Compensation Arrangement with Individual, Shares Issued   76,181      
Deferred Compensation Arrangement with Individual, Distribution Paid 0   (1,673)   1,673
Shares Outstanding, Ending Balance at Dec. 31, 2021   28,499,630      
Stockholders' Equity, Ending Balance at Dec. 31, 2021 1,624,184 $ 301 347,452 1,345,321 (68,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 490,662     490,662  
Treasury Stock, Shares, Acquired   (1,200,000)      
Treasury Stock, Value, Acquired, Cost Method (55,334)       (55,334)
Stock options exercised - shares   49,900      
Stock options exercised - value 1,366   (810)   2,176
Stock-based compensation expense 8,787   8,787    
Deferral of Executive and Director Compensation 1,060   1,060    
Deferred Compensation Arrangement with Individual, Shares Issued   90,553      
Deferred Compensation Arrangement with Individual, Distribution Paid 0   (3,850)   3,850
Shares Outstanding, Ending Balance at Dec. 31, 2022   27,440,083      
Stockholders' Equity, Ending Balance at Dec. 31, 2022 2,070,725 $ 301 352,639 1,835,983 (118,198)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 465,365     465,365  
Treasury Stock, Shares, Acquired 700,000 (726,000)      
Treasury Stock, Value, Acquired, Cost Method $ (65,344)       (65,344)
Stock options exercised - shares 944,135 944,135      
Stock options exercised - value $ 33,795   (10,500)   44,295
Stock-based compensation expense 11,370   11,370    
Deferral of Executive and Director Compensation 1,028   1,028    
Deferred Compensation Arrangement with Individual, Shares Issued   103,081      
Deferred Compensation Arrangement with Individual, Distribution Paid 0   (4,630)   4,630
Shares Outstanding, Ending Balance at Dec. 31, 2023   27,761,299      
Stockholders' Equity, Ending Balance at Dec. 31, 2023 $ 2,516,939 $ 301 $ 349,907 $ 2,301,348 $ (134,617)