Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

The following weighted average assumptions were used to determine the fair value of the stock options granted on the original grant date for expense recognition purposes for options granted during December 31, 2017, 2016 and 2015 using a Black Scholes-Merton Model:



	2017			2016			2015

Director and Officers:
Expected dividend yield	$	0.26		$	0.22		$	0.18
Expected volatility	30.81		%	41.19		%	44.14		%
Risk-free interest rate	1.90		%	2.00		%	1.97		%
Expected life (in years)	5.00			7.68			8.00
Employees:
Expected dividend yield	$	0.26		$	0.25		$	0.22
Expected volatility	30.67		%	34.50		%	42.71		%
Risk-free interest rate	1.89		%	1.73		%	1.41		%
Expected life (in years)	5.00			5.69			8.00

Summary of Stock Options Outstanding

The following is a summary of stock options vested and exercisable as of December 31, 2017:



		Weighted Average	Weighted
Range of	Number	Remaining	Average
Exercise	of	Contractual	Exercise		Intrinsic
Prices	Shares	Life	Price		Value
					(in thousands)
$4.54 - 22.76	424,130	4.36	$	12.41	$	10,303
$23.57 - 32.85	107,456	8.31	30.10		709
$32.90 - 37.30	25,725	9.19	34.07		68
Total	557,311	5.35	$	16.82	$	11,080

The following is a summary of stock options vested and exercisable as of December 31, 2016:



		Weighted Average	Weighted
Range of	Number	Remaining	Average
Exercise	of	Contractual	Exercise		Intrinsic
Prices	Shares	Life	Price		Value
					(in thousands)
$4.54 - 20.92	338,308	4.75	$	8.03	$	8,465
$20.96 - 26.50	71,928	8.56	22.50		759
Total	410,236	5.42	$	10.57	$	9,224

The following is a summary of stock options vested and exercisable as of December 31, 2015:



		Weighted Average	Weighted
Range of	Number	Remaining	Average
Exercise	of	Contractual	Exercise		Intrinsic
Prices	Shares	Life	Price		Value
					(in thousands)
$4.31 - 8.65	421,237	4.89	$	7.04	$	6,814
$8.70 - 22.76	27,134	7.82	15.31		215
Total	448,371	5.07	$	7.54	$	7,029

Summary of Stock Option Activity

A summary of option activity under the plans is as follows:



			Weighted Average Exercise
Options	Shares		Price

Outstanding at December 31, 2016	1,450,704		$	21.33
Granted	410,960		34.46
Exercised	(189,415	)	11.93
Forfeited or Expired	(105,140	)	29.93
Outstanding at December 31, 2017	1,567,109		$	25.27
Exercisable at December 31, 2017	557,311		$	16.82

Summary of Unvested Restricted Stock Awards

A summary of the unvested restricted stock awards is as follows:



			Weighted Average Grant date
Restricted stock	Shares		Fair Value

Unvested at December 31, 2016	408,162		$	20.47
Granted	124,126		33.97
Vested	(170,434	)	19.97
Forfeited	(20,054	)	22.09
Unvested at December 31, 2017	341,800		$	25.52

Summary of Grant Date Fair Value of Awards During Period



	2017		2016		2015
Grant date fair value of awards during the period:	(in thousands)
Options	$	3,699	$	6,102	$	3,685
Restricted stock	4,217		3,147		2,985
Total	$	7,916	$	9,249	$	6,670

Summary of Share-Based Compensation Expense



	2017		2016		2015
Share-based compensation expense:	(in thousands)
Options	$	2,904	$	1,681	$	833
Restricted stock	3,554		2,676		2,058
Total	$	6,458	$	4,357	$	2,891

Summary of Income Tax Benefit Related to Share-Based Compensation



	2017		2016		2015
Income tax benefit related to share-based compensation:	(in thousands)
Options	$	1,413	$	1,610	$	2,165
Restricted stock	1,051		458		280
Total	$	2,464	$	2,068	$	2,445