Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholder's Equity [Abstract]

Nonvested stock activity

The following table represents the nonvested stock activity for the six months ended June 30, 2012:

	Number of Shares			Weighted average grant date fair value
Nonvested shares outstanding at December 31, 2011		494,995		$	24.17
Granted		200,740		$	19.11
Vested		(132,676	)	$	24.61
Forfeited		(53,690	)	$	24.27
Nonvested shares outstanding at June 30, 2012		509,369		$	22.57

Shares issued during 2012 under employee stock purchase plan

There were 250,000 shares initially reserved for the plan. The table below details the shares issued during 2012.

	Number of Shares		Per share price
Shares available as of December 31, 2011		111,432
Shares issued during three months ended March 31, 2012		15,556	$	12.19
Shares issued during three months ended June 30, 2012		12,318	$	17.60
Shares available as of June 30, 2012		83,558