Share-Based Compensation (Tables)

6 Months Ended

Jun. 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 six months endedJune 30, 2015 and 2014:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2015			2014			2015			2014
(in thousands)
Awards to non-employee directors	$	160		$	132		$	311		$	256
Awards to key employees	250			295			636			809
Total compensation expense	410			427			947			1,065
Less: tax benefit	(165		)	(172		)	(381		)	(429		)
Share-based compensation amounts included in net income	$	245		$	255		$	566		$	636

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 six months ended June 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— June 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 six months ended June 30, 2015:

	Number of Shares		Weighted Average Fair Value
Outstanding— December 31, 2014	123,038		$	32.60
Granted	29,763		$	48.21
Vested	(43,839	)	$	28.01
Expired	(2,520	)	$	28.83
Outstanding— June 30, 2015	106,442		$	37.97