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Stock Based Compensation Expense (Tables)

9 Months Ended

Sep. 30, 2012

Stock Based Compensation Expense [Abstract]

Summary of Option activity

Option activity within each plan is as follows:

		Incentive Stock Option Plans				Weighted Average Price Per Share				Exercisable Weighted Average Price Per Share
Balance outstanding, December 31, 2011			1,388,514			$	7.44			$	7.26
Options granted			—				—
Options exercised, range from $7.50-$14.74			(35,340	)			13.37
Options expired or forfeited			—				—
Balance outstanding, March 31, 2012			1,353,174			$	7.28			$	6.95
Options granted			—				—
Options exercised, range from $7.50-$14.74			(64,712	)			13.77
Options expired or forfeited			(14,000	)			7.50
Balance outstanding, June 30, 2012			1,274,462			$	6.94			$	6.27
Options granted			—				—
Options exercised, range from $14.74-$14.99			(109,681	)			14.75
Options expired or forfeited			—				—
Balance outstanding, September 30, 2012			1,164,781			$	6.20			$	4.60

Summary of stock options summarized by exercise price

Information relating to stock options at September 30, 2012 summarized by exercise price is as follows:

		Outstanding Weighted Average												Exercisable Weighted Average
Exercise Price Per Share		Shares				Remaining Life (Months)				Exercise Price				Shares				Exercise Price
Incentive Stock Option Plan:
$3.67			450,000				3			$	3.67				450,000			$	3.67
$7.50			678,666				98			$	7.50				69,667			$	7.50
$11.32—$14.75			36,115				70			$	13.38				22,781			$	14.02
			1,164,781							$	6.20				542,448			$	4.60

Weighted average exercise prices for options granted and exercisable and the weighted average remaining contractual life for options outstanding

The weighted average exercise prices for options granted and exercisable and the weighted average remaining contractual life for options outstanding as of September 30, 2012 was as follows:

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Months)				Intrinsic Value (thousands)
As of September 30, 2012:
Incentive Stock Option Plans:
Outstanding			1,164,781			$	6.20				61			$	33,308
Expected to Vest			1,155,407			$	6.19				60			$	33,054
Exercisable			542,448			$	4.60				17			$	16,382

Summery of non-vested shares

Restricted Shares—A status summary of non-vested shares as of and for the nine months ended September 30, 2012 is presented below:

		Number of Shares				Weighted Average Grant-Date Fair Value
Nonvested shares at December 31, 2011			101,640			$	11.37
Granted			207,184			$	20.45
Vested			(82,640	)		$	11.73
Forfeited			—				—
Nonvested shares at March 31, 2012			226,184			$	19.55
Granted			12,204				24.58
Vested			(12,204	)			24.58
Forfeited			(1,367	)		$	20.47
Nonvested shares at June 30, 2012			224,817			$	19.55
Granted			28,148				27.55
Vested			(5,148	)			27.79
Forfeited			—			$	—
Nonvested shares at September 30, 2012			247,817			$	20.29

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Tabular disclosure of the changes in outstanding nonvested shares.

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