Stock-Based Compensation and Directors Stock Purchase Plan Stock-Based Compensation and Directors Stock Purchase Plan (Additional Information About Stock Options and SARs Exercises) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Intrinsic value of options and SARs exercised	$ 1,723	$ 2,448	$ 7,664
Tax benefit realized from options and SARs exercised	$ 362	$ 462	$ 1,488