Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

Stock-based compensation plans

Schedule of components of stock compensation expense

	2015		2014		2013
	(in thousands)
2007 Stock Incentive Plan	$	4,102	$	3,459	$	3,393
Employee Stock Purchase Plan		48		50		46
Total Stock Compensation Expense	$	4,150	$	3,509	$	3,439

Summary of the activity under the 1996 Plan

					Weighted
					Average
					Remaining
	Options		Weighted		Contractual
	Available		Average		Term (in	Aggregate
	for Grant	Options	Exercise Price		years)	Intrinsic Value
Outstanding as of December 31, 2012	—	136,928	$	8.60	2.23	$	781,692
Options exercised	—	(54,991)		7.96
Options cancelled	—	(6,500)		5.01
Outstanding as of December 31, 2013	—	75,437	$	9.38	1.49	$	601,991
Options exercised	—	(26,437)		9.71
Options cancelled	—	—		—
Outstanding as of December 31, 2014	—	49,000	$	9.20	0.59	$	622,300
Options exercised	—	(49,000)		9.20
Options cancelled	—	—		—
Outstanding as of December 31, 2015	—	—	$	—	—	$	—
Vested and expected to vest at:
December 31, 2015		—	$	—	—	$	—
Options exercisable at:
December 31, 2013		75,437	$	9.38	1.49	$	601,991
December 31, 2014		49,000	$	9.20	0.59	$	622,300
December 31, 2015		—	$	—	—	$	—

Restricted stock

Stock-based compensation plans

Summary of activity under the 2007 Plan

	Shares
Restricted stock at December 31, 2012	682,654
Granted in 2013 (vesting over 4 years)	130,000
Granted in 2013 (vesting on first anniversary from date of issuance)	21,408
Cancelled in 2013	(60,110)
Vested in 2013	(258,822)
Restricted stock at December 31, 2013	515,130
Granted in 2014 (vesting over 3 years)	174,500
Granted in 2014 (vesting over 4 years)	13,000
Granted in 2014 (vesting on first anniversary from date of issuance)	50,208
Cancelled in 2014	(5,750)
Vested in 2014	(221,732)
Restricted stock at December 31, 2014	525,356
Granted in 2015 (vesting over 3 years)	125,000
Granted in 2015 (vesting over 4 years)	5,000
Granted in 2015 (vesting on first anniversary from date of issuance)	16,440
Cancelled in 2015	—
Vested in 2015	(275,201)
Restricted stock at December 31, 2015	396,595

Summary of activity under the 2007 Plan

		Weighted Average
	Number Outstanding	Grant Date Fair Value		Aggregate Value
Balance as of December 31, 2012	682,654	$	12.83	$	8,756,990
Shares granted	151,408		14.25		2,158,011
Shares cancelled	(60,110)		12.41		(745,876)
Shares vested	(258,822)		12.01		(3,108,651)
Balance as of December 31, 2013	515,130	$	13.71	$	7,060,474
Shares granted	237,708		19.84		4,710,362
Shares cancelled	(5,750)		14.02		(80,630)
Shares vested	(221,732)		13.24		(2,903,595)
Balance as of December 31, 2014	525,356	$	16.72	$	8,786,611
Shares granted	146,440		18.53		2,713,159
Shares cancelled	—		—		—
Shares vested	(275,201)		15.87		(4,367,983)
Balance as of December 31, 2015	396,595	$	17.98	$	7,131,787