Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2017

Transactions under the 2012 Plan for the years ending December 31, 2017, 2016, and 2015 were as follows:


(in thousands, except share and per share data)	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding, December 31, 2014		6,505,663		$	4.07
Granted		427,800			10.47
Exercised		(3,249,160	)		3.95
Cancelled		(202,835	)		4.36

Outstanding, December 31, 2015		3,481,468			4.96
Granted		362,800			6.40
Exercised		(234,833	)		4.57
Cancelled		(144,100	)		6.43

Outstanding, December 31, 2016		3,465,335			5.07
Granted		688,800			5.27
Exercised		(180,000	)		3.67
Cancelled		(122,000	)		6.64

Outstanding, December 31, 2017		3,852,135		$	5.12		6.47	$	1,152

Options exercisable, December 31, 2017		2,925,502		$	5.12		5.58	$	1,152

Options exercisable, December 31, 2016		2,671,835		$	4.40		5.88	$	3,383

Options available for future grant at December 31, 2017		303,928

A summary of the status of non-vested restricted stock as of December 31, 2017, 2016 and 2015 is as follows:


	Number of Shares			Weighted-Average Grant Date Fair Value
Non-vested, December 31, 2014		144,508		$	4.70
Granted		1,590,574			9.01
Vested		(148,694	)		4.88
Cancelled		—			—

Non-vested, December 31, 2015		1,586,388			9.00
Granted		711,770			5.35
Vested		(617,666	)		8.90
Cancelled		—			—

Non-vested, December 31, 2016		1,680,492			7.49
Granted		907,032			4.14
Vested		(778,965	)		7.66
Cancelled		—			—

Non-vested, December 31, 2017		1,808,559		$	5.74