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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Schedule of Weighted Average Number of Shares [Table Text Block]
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 and six months ended June 30, 2012 and 2013 (in thousands, except per share data):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012

2013

2012

2013
Income (loss) from continuing operations
$
(2,945
)
 
$
2,089

 
$
(2,785
)
 
$
1,529

Basic weighted-average common shares outstanding
56,934

 
58,384

 
56,484

 
58,194

Assumed exercise of dilutive stock options and restricted stock
—

 
413

 
—

 
422

Diluted weighted-average common shares outstanding
56,934

 
58,797

 
56,484

 
58,616

Income (loss) from continuing operations:
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
(0.05
)
 
$
0.04

 
$
(0.05
)
 
$
0.03

Diluted earnings (loss) per share
$
(0.05
)
 
$
0.04

 
$
(0.05
)
 
$
0.03
Outstanding equity awards not included in calculation of diluted net loss per share
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
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2013
 
2012
 
2013
 
Number of
Potential
Shares
 
Range of
Exercise Prices
 
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
9,298,263

 
$0.47 - $16.36

 
7,299,887

 
$1.26 - $16.36

 
9,298,263

 
$0.47 - $16.36

 
8,725,951

 
$1.06 - $16.36

Unvested stock awards
1,132,568

 
$
—

 
5,550

 
—

 
1,132,568

 
$
—

 
11,753

 
$
—

Warrants
1,602,489

 
$
2.40

 
1,602,489

 
2.40

 
1,602,489

 
$
2.40

 
1,602,489

 
$
2.40