Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation Plans

Schedule of components of stock compensation expense

	2017		2016		2015
	(in thousands)
2007 Stock Incentive Plan	$	4,207	$	3,681	$	4,102
Employee Stock Purchase Plan		63		36		48
Total Stock Compensation Expense	$	4,270	$	3,717	$	4,150

Summary of restricted stock activity under the 2007 Plan

		Weighted Average		Aggregate Grant
	Number Outstanding	Grant Date Fair Value		Date Fair Value
Balance as of December 31, 2014	525,356	$	13.71	$	8,786,611
Shares granted	146,440		18.53		2,713,159
Shares forfeited	—		—		—
Shares vested	(275,201)		15.87		(4,368,570)
Balance as of December 31, 2015	396,595	$	17.98	$	7,131,200
Shares granted	136,645		21.55		2,944,941
Shares forfeited	(20,377)		17.79		(362,536)
Shares vested	(213,528)		17.12		(3,655,269)
Balance as of December 31, 2016	299,335	$	20.24	$	6,058,336
Shares granted	215,603		24.89		5,365,731
Shares forfeited	(10,999)		24.38		(268,200)
Shares vested	(175,817)		19.61		(3,448,628)
Balance as of December 31, 2017	328,122	$	23.49	$	7,707,239