Earnings per Share (Reconciliation between Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	187,875	42,000
Net income for basic and diluted earnings per share	$ 24,723	$ 25,710
Basic weighted average shares outstanding	30,476,000	30,524,000
Dilutive effect of stock options and restricted stock awards	207,000	80,000
Diluted weighted average shares outstanding	30,683,000	30,604,000
Basic earnings per common share	$ 0.81	$ 0.84
Diluted earnings per common share	$ 0.81	$ 0.84