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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 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Income per share of common stock:                
Net Income (Loss) $ 38,782 $ 30,831 $ 34,113 $ 33,353 $ 26,057 $ 22,439 $ 103,726 $ 81,849
Weighted-average shares for basic income per common share (in shares) 28,639     28,594     28,633 28,574
Effect of dilutive securities:                
Employee and director stock options (in shares) 99     133     97 109
Adjusted weighted-average shares and assumed exercises for diluted income per common share (in shares) 28,738     28,727     28,730 28,683
Basic net income per common share (in dollars per share) $ 1.35     $ 1.17     $ 3.62 $ 2.86
Diluted net income per common share (in dollars per share) 1.35     1.16     3.61 2.85
Cash dividends per share of common stock (in dollars per share) $ 0.06     $ 0.05     $ 0.18 $ 0.15
Options                
Anti-dilutive securities                
Anti-dilutive shares of common stock excluded from the calculation of dilutive securities 0     0     0 0