Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation

Summary of the Company's stock option and restricted stock activity (in thousands)

		Weighted-					Weighted-
		Average		Aggregate			Average
	Stock	Exercise		Intrinsic		Restricted	Grant-Date
	Options	Price		Value		Stock	Fair Value
Outstanding (stock options); non-vested (restricted stock) at December 31, 2016	59,500	$	58.36	$	1,035	17,697	$	64.01
Granted	9,900		77.89		—	17,179		77.44
Exercised (stock options); vested (restricted stock)	(2,000)		35.95		86	(16,730)		73.32
Forfeited	—		—		—	(482)		65.97
Outstanding (stock options); non-vested (restricted stock) at December 31, 2017	67,400	$	61.90	$	1,033	17,665	$	69.96
Exercisable at December 31, 2017	67,400	$	61.90	$	1,033	n/a		n/a

	2017		2016		2015
Weighted-average fair value of stock options granted during the year	$	17.61	$	13.12	$	10.79
Weighted-average remaining contractual life for stock options in years		6.57		6.78		6.32
Total fair value of stock options vested during the year	$	174	$	130	$	107
Total intrinsic value of stock options exercised during the year	$	86	$	150	$	30
Total fair value of restricted stock vested during the year	$	1,232	$	907	$	1,099