Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Shares awarded to non-employee directors [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The table below presents the amounts included in net income related to share-based compensation expense for the three and nine months endedSeptember 30, 2015 and 2014:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
(in thousands)
Awards to non-employee directors	$	165		$	137		$	475		$	394
Awards to key employees	334			317			970			1,125
Total compensation expense	499			454			1,445			1,519
Less: tax benefit	(201		)	(183		)	(582		)	(612		)
Share-based compensation amounts included in net income	$	298		$	271		$	863		$	907

Awards to non-employee directors [Member]

Shares awarded to non-employee directors [Line Items]

Schedule of Share-based Compensation, Activity [Table Text Block]

A summary of the stock activity for our non-employee directors during the nine months ended September 30, 2015 is presented below:

	Number of Shares		Weighted Average Fair Value
Outstanding— December 31, 2014	—		$	—
Granted	14,484		$	45.54
Vested	(14,484	)	$	45.54
Outstanding— September 30, 2015	—		$	—

Award to key employees [Member]

Shares awarded to non-employee directors [Line Items]

Schedule of Share-based Compensation, Activity [Table Text Block]

The table below presents the summary of the stock activity for awards to key employees for the nine months endedSeptember 30, 2015:

	Number of Shares		Weighted Average Fair Value
Outstanding— December 31, 2014	123,038		$	32.60
Granted	33,719		$	48.21
Vested	(43,839	)	$	28.01
Expired	(2,520	)	$	28.83
Outstanding— September 30, 2015	110,398		$	38.34