Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Per Share [Abstract]
Consolidated net income	$ 6,274	$ 7,954	$ 26,039	$ 20,305
Basic EPS [Abstract]
Basic weighted average shares (in shares)	19,659,217	19,378,054	19,613,868	19,290,096
Basic EPS (in dollars per share)	$ 0.32	$ 0.41	$ 1.33	$ 1.05
Effect of Dilutive Securities [Abstract]
Stock options (in shares)	408,196	504,940	163,295	477,571
Diluted weighted average shares (in shares)	20,067,413	19,882,994	19,777,163	19,767,667
Diluted EPS (in dollars per share)	$ 0.31	$ 0.40	$ 1.32	$ 1.03
Income per Share [Abstract]
Average stock price (in dollars per share)	$ 53.86		$ 53.86
Convertible Senior Notes [Member]
Income per Share [Abstract]
Shares excluded from calculation of diluted net income per share (in shares)	3,202,808		3,202,808