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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted
The following is a reconciliation of weighted-average shares outstanding used in the calculation of basic and diluted earnings from continuing operations per share (in thousands, except per share data):

 
Year Ended December 31,
 
2012
 
2013
 
2014
Income (loss) from continuing operations
$
(10,402
)
 
$
5,540

 
$
8,055

Basic weighted-average common shares outstanding
56,954

 
58,521

 
60,171

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

 
726

 
3,727

Diluted weighted-average common shares outstanding
56,954

 
59,247

 
63,898

Income (loss) from continuing operations:
 
 
 
 
 
Basic income (loss) per share
$
(0.18
)
 
$
0.09

 
$
0.13

Diluted income (loss) per share
$
(0.18
)
 
$
0.09

 
$
0.13
Outstanding equity awards not included in calculation of diluted net loss per share
Outstanding equity awards not included in the calculation of diluted net earnings (loss) per share because their effect was anti-dilutive were as follows:
 
 
December 31, 2012
 
December 31, 2013
 
December 31, 2014
 
Number of
Potential
Shares
 
Range of
Exercise Prices
 
Number of
Potential
Shares
 
Range of
Exercise Prices
 
Number of
Potential
Shares
 
Range of
Exercise Prices
Stock options
8,952,129

 
$0.47 - $16.36

 
5,879,842

 
$1.55 - $15.15

 
2,518,000

 
$3.46 - $7.84

Unvested stock awards
655,402

 
$
—

 
92,811

 
$
—

 
55,900

 
$
—

Warrants
1,602,489

 
$
2.40

 
1,602,489

 
$
2.40

 
—

 
$
—