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Earnings Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

Basic earnings per share, including continuing and discontinued operations, is calculated by dividing net income (loss) for the period by the weighted average number of common shares outstanding during the period. Diluted earnings per share, including continuing and discontinued operations, is computed by dividing net income (loss) for the period by the weighted average number of shares of common stock outstanding during the period and including the dilutive effect of common stock that would be issued assuming conversion or exercise of outstanding warrants, stock options, share based compensation awards and other dilutive securities.

The following is a reconciliation of weighted-average shares outstanding used in the calculation of basic and diluted earnings from continuing operations per share for the three months ended March 31, 2014 and 2015 (in thousands, except per share data):
 
Three Months Ended
 
March 31,
 
2014

2015
Net income (loss)
$
(412
)
 
$
3,871

Basic weighted-average common shares outstanding
59,678

 
60,760

Assumed exercise of dilutive stock options, warrants and restricted stock
—

 
4,056

Diluted weighted-average common shares outstanding
59,678

 
64,816

Net income (loss):
 
 
 
   Basic income (loss) per share
$
(0.01
)
 
$
0.06

   Diluted income (loss) per share
$
(0.01
)
 
$
0.06



Outstanding equity awards not included in the calculation of diluted net income (loss) per share because their effect was anti-dilutive were as follows:

Three Months Ended

March 31,
 
2014

2015
 
Number of
Potential
Shares

Range of
Exercise Prices

Number of
Potential
Shares

Range of
Exercise Prices
Stock options
10,923,538


$0.47 - $7.84


4,401,602


$4.00 - $7.04

Unvested stock awards
43,220


$
—


336,708


$
—

Warrants
1,602,489

 
$
2.40

 
—

 
$
—



Shares issued

Common stock activity during the period is as follows (in thousands):
 
Three Months Ended
 
March 31,
 
2014
 
2015
Shares issued:
 
 
 
Options exercised
632

 
62

Restricted stock awards granted
—

 
283

Shares purchased under stock plan
198

 
—

Share decreases:
 
 
 
Shares repurchased for tax purposes
(15
)
 
(1
)