Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2014

Transaction under Stock Option Plan

Transactions under the Plan for the years ending December 31, 2014, 2013, and 2012 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, 2011		5,138,486			4.08
Granted		2,309,650			4.36
Exercised		(8,300	)		3.61
Cancelled		(292,533	)		5.70
Outstanding, December 31, 2012		7,147,303			4.11
Granted		2,649,900			3.28
Exercised		(570,168	)		1.68
Cancelled		(2,479,732	)		4.58
Outstanding, December 31, 2013		6,747,303			3.81
Granted		1,099,300			4.95
Exercised		(613,138	)		2.26
Cancelled		(727,801	)		4.54
Outstanding, December 31, 2014		6,505,664		$	4.07	7.19	$9,084
Vested and unvested expected to vest at December 31, 2014		6,485,430		$	4.10	5.80	$9,056
Options exercisable, December 31, 2014		3,781,162		$	4.10	5.80	$4,130
Options exercisable, December 31, 2013		3,471,935		$	4.01	5.03	$2,654
Options available for future grant		4,585,769

Summary of Nonvested Restricted Stock

A summary of the status of non-vested restricted stock as of December 31, 2014, 2013 and 2012 is as follows:

	Number of Shares			Weighted-Average Grant Date Fair Value
Non-vested, December 31, 2011		950,906		$	4.34
Granted		258,032			4.39
Vested		(351,829	)		4.32
Cancelled		(123,370	)		4.34
Non-vested, December 31, 2012		733,739			4.37
Granted		75,272			4.34
Vested		(292,399	)		4.31
Cancelled		(163,747	)		4.42
Non-vested, December 31, 2013		352,865			4.38
Granted		66,828			5.07
Vested		(253,835	)		4.38
Cancelled		(21,350	)		4.41
Non-vested, December 31, 2014		144,508		$	4.70