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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted earnings (loss) per share:
 
Three Months Ended March 31,
 
2013
 
2012
 
 
 
 
Weighted-average common shares outstanding - basic
47,859,774

 
44,367,499

Dilutive effect of equity-based incentive awards
494,670

 
1,403,729

Weighted-average common shares outstanding - diluted
48,354,444

 
45,771,228

 
 

 
 

Anti-dilutive equity-based incentive awards excluded from the computation of diluted income per share
525,410

 
7,000