Stock Options (Tables)

9 Months Ended

Sep. 30, 2018

Stock Options

Summary of option activity under stock option plans

				Weighted
		Weighted		average
		average		remaining	Aggregate
	Number of	exercise		contractual	intrinsic
	options	price		term (years)	value ($)
					(in Thousands)
Options outstanding at December 31, 2017	668,166	$	20.41
Plus: Options granted	229,700		38.30
Less:
Options exercised	64,026		18.00
Options expired	—		—
Options forfeited	21,113		20.83
Options outstanding at September 30, 2018	812,727		25.65	6.22	$	15,728
Options fully vested and exercisable at September 30, 2018	322,360	$	19.77	4.37	$	8,135