Share Repurchase Plan (Details) - USD ($)	3 Months Ended		35 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	May 31, 2016
Equity [Abstract]
Amount authorized by the company's Board of Directors (not more than)				$ 30,000,000
Common stock repurchased under share repurchase program (in shares)	72,742	0	377,925
Average cost per share (in dollars per share)	$ 32.29		$ 25.94
Amount of program-to-date purchases	$ 2,300,000		$ 9,800,000