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Selected Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2013
Selected Quarterly Financial Data Tables  
Selected Quarterly Financial Data (Unaudited) (Tables)

The following is a summary of the quarterly results of operations for the years ended December 31, 2013 and 2012 (in thousands, except for per share amounts):

    Quarters Ended
    March 31   June 30   September 30   December 31
                         
(in thousands, except per share amounts)                        
2013                        
Revenues   $ 25,434    $ 36,505    $ 39,202    $ 54,451 
Operating (loss) income     (4,531)     (9,321)     1,769      10,588 
Net (loss) income     (7,796)     (12,389)     (1,087)     7,768 
Basic (loss) income per common share    $ (0.09)   $ (0.13)   $ (0.01)   $ 0.08 
Diluted (loss) income per common                        
     and potential common share    $ (0.09)   $ (0.13)   $ (0.01)   $ 0.07 
                         
2012                        
Revenues   $ 22,924    $ 53,517    $ 27,019    $ 27,184 
Operating (loss) income     (5,045)     11,206      733      (8,018)
Net (loss) income     (10,563)     7,355      (3,324)     (12,203)
Basic (loss) income per common share    $ (0.12)   $ 0.08    $ (0.04)   $ (0.14)
Diluted (loss) income per common                        
     and potential common share    $ (0.12)   $ 0.08    $ (0.04)   $ (0.14)