Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 27, 2018
Earnings Per Share [Abstract]
Stock dividend, percent				300.00%
Net Income	$ 36,279	$ 29,326	$ 26,534
Basic Shares, in Shares	14,408	14,310	14,206
Basic Earnings, in USD Per Share	$ 2.52	$ 2.05	$ 1.87
Dilutive Average Shares Attributable to Stock Options, in Shares	80	96	91
Weighted Average Shares - Diluted, in Shares	14,488	14,406	14,297
Diluted Earnings, In USD Per Share	$ 2.50	$ 2.04	$ 1.86