Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Valuation Assumptions

The following table includes the weighted- average assumptions used in estimating the fair values and the resulting weighted-average fair value of stock options granted in the periods presented:

	Year Ended December 31, 2017			Year Ended December 31, 2016			Year Ended December 31, 2015
Weighted average fair values of stock options granted	$	15.38		$	19.50		$	7.90
Expected volatility	37.9		%	55.5		%	55.4		%
Expected dividends	.56		%	.61		%	1.42		%
Weighted average risk-free interest rate	1.64		%	1.40		%	1.03		%
Expected life of stock options (in years)	3.5			3.5			3.5

Schedule of Stock Options Activity

A summary of stock option activity for the years ended December 31, 2017, 2016 and 2015 is as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
						(in thousands)
Outstanding at January 1, 2015	207,000		$	16.41	1.88	$	121
Granted	42,000		$	22.25
Exercised	(109,122	)	$	20.25
Canceled	—
Outstanding at December 31, 2015	139,878		$	15.17	2.32	$	2,465
Granted	42,000		$	49.22
Exercised	(72,379	)	$	11.38
Canceled	—
Outstanding at December 31, 2016	109,499		$	30.73	3.28	$	2,882
Granted	42,000		$	53.90
Exercised	(3,500	)	$	14.90
Canceled	—
Outstanding at December 31, 2017	147,999		$	37.68	2.94	$	6,152
Exercisable at December 31, 2017	71,499		$	26.65	2.02	$	3,761

Schedule of Nonvested Share Activity

A summary of non-vested options and changes for the years ended December 31, 2017, 2016 and 2015 is as follows:

	Non-Vested Number of Shares		Weighted Average Exercise Price
Non-vested balance at January 1, 2015	67,500		$	16.52
Granted	42,000		$	22.25
Vested	(33,750	)	$	17.47
Canceled	—		$	—
Non-vested balance at December 31, 2015	75,750		$	19.27
Granted	42,000		$	49.22
Vested	(43,125	)	$	18.89
Canceled	—		$	—
Non-vested balance at December 31, 2016	74,625		$	36.35
Granted	42,000		$	53.90
Vested	(40,125	)	$	32.54
Canceled	—		$	—
Non-vested balance at December 31, 2017	76,500		$	47.99

Schedule of Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table summarizes information about stock options outstanding by price range as of December 31, 2017:

	Options Outstanding				Options Exercisable
Exercise Prices	Number Outstanding	Weighted-Average Remaining Contractual Life (Years)	Weighted-Average Exercise Price		Number of Shares	Weighted-Average Exercise Price
$14.89	24,624	0.17	$	2.48	24,624	$	5.13
$21.19	33,375	0.46	$	4.78	24,375	$	7.22
$28.59	6,000	0.09	$	1.16	4,125	$	1.65
$49.22	42,000	0.95	$	13.97	18,375	$	12.65
$53.90	42,000	1.28	$	15.29	—	$	—
	147,999	2.94	$	37.68	71,499	$	26.65

Schedule of Nonvested Restricted Stock Activity

A summary of the status of the Company’s non-vested restricted stock grant shares is presented in the following table:

	Shares		Weighted-Average Grant Date Fair Value
Non vested at January 1, 2015	188,522		$	17.13
Granted	132,069		$	30.29
Vested	(108,798	)	$	17.35
Forfeited	(8,479	)	$	17.20
Non vested at December 31, 2015	203,314		$	25.56
Granted	26,119		$	44.79
Vested	(101,441	)	$	23.25
Forfeited	(4,338	)	$	35.54
Non vested at December 31, 2016	123,654		$	31.17
Granted	56,251		$	56.75
Vested	(72,810	)	$	29.50
Forfeited	—		$	—
Non vested at December 31, 2017	107,095		$	45.74