Stock Options (Tables)

3 Months Ended

Mar. 31, 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	—		—
Less:
Options exercised	25,013		17.60
Options expired	—		—
Options forfeited	15,800		18.58
Options outstanding at March 31, 2018	627,353		20.57	5.36	$	11,499
Options fully vested and exercisable at March 31, 2018	344,435	$	19.47	4.69	$	6,692