Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock Based Compensation [Abstract]

Assumptions used in determining the fair value of stock options for grants

The following assumptions were used in determining the fair value of stock options for grants issued in 2012, 2011 and 2010:

	2012	2011	2010
Expected volatility	71.84%	68.91%-71.53%	66.48%-68.13%
Expected term	4.75 years	4.75 years	4.75 years
Risk-free interest rate	0.66%	1.02%-2.00%	1.25%-2.52%

Summary of stock options activity

The following table is a summary of the Company's stock option activity issued to employees and related information:

				Weighted Average
	Number of Shares			Exercise Price		Options Exercisable
Outstanding at December 31, 2010		1,853,793		$	7.51		863,623
Granted		586,000			5.55
Exercised		(31,500	)		4.61
Forfeited or expired		(118,420	)		14.80
Outstanding at December 31, 2011		2,289,873			6.67		1,122,122
Granted		392,400			12.46
Exercised		(263,092	)		5.15
Forfeited or expired		(154,782	)		18.72
Outstanding at December 31, 2012		2,264,399			7.02
Exercisable at December 31, 2012		1,234,623		$	6.12

Summary of nonvested stock option and restricted stock

A summary of the Company's nonvested stock options and restricted stock activity is presented below:

	Nonvested Stock Options					Nonvested Restricted Stock
	Number of Shares			Weighted- Average Grant- Date Fair Value		Number of Shares			Weighted- Average Grant- Date Fair Value
Nonvested at December 31, 2010		990,170		$	2.57		105,324		$	6.17
Granted		586,000			3.18		61,072			5.24
Vested during period		(370,919	)		2.51		(107,497	)		5.99
Forfeited		(37,500	)		2.89		-			-
Nonvested at December 31, 2011		1,167,751			2.89		58,899			5.54
Granted		392,400			7.14		43,422			6.82
Vested during period		(491,875	)		2.62		(71,176	)		6.23
Forfeited		(38,500	)		3.25		-			-
Nonvested at December 31, 2012		1,029,776		$	4.62		31,145		$	5.76