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Income and Dividends Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Income per share of common stock:    
Net Income (Loss) $ 30,582 $ 34,113
Weighted-average shares for basic income per common share (in shares) 28,671 28,623
Effect of dilutive securities:    
Employee and director stock options (in shares) 99 96
Adjusted weighted-average shares and assumed exercises for diluted income per common share (in shares) 28,770 28,719
Basic net income per common share (in dollars per share) $ 1.07 $ 1.19
Diluted net income per common share (in dollars per share) 1.06 1.19
Cash dividends per share of common stock (in dollars per share) $ 0.06 $ 0.06
Options    
Anti-dilutive securities    
Anti-dilutive shares of common stock excluded from the calculation of dilutive securities 0 0