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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Net income loss available to common stockholders          
Net income $ 4,900 $ (15,348) $ 9,752 $ (34,041)  
Net income applicable to preferred stock 476   951    
Net income applicable to common stock $ 4,424   $ 8,801    
Determination of shares:          
Weighted-average common shares outstanding (in shares) 80,243,000   79,803,000    
Assumed conversion of dilutive employee stock-based awards (in shares) 2,355,000   2,307,000    
Assumed conversion of restricted stock (in shares) 58,000   60,000    
Diluted weighted-average common shares outstanding before participating security 82,656,000   82,170,000    
Assumed conversion of preferred stock (in shares) 8,624,000   8,624,000    
Diluted weighted-average common shares outstanding (in shares) 91,280,000   90,794,000    
Anti-dilutive securities, options to purchase shares outstanding     1,621,219 7,195,937  
Calculation of basic EPS:          
Net income applicable to common stock $ 4,424   $ 8,801    
Weighted-average common shares outstanding (in shares) 80,243,000   79,803,000    
Basic EPS $ 0.06 $ (0.20) $ 0.11 $ (0.43)  
Calculation of diluted EPS using two-class method:          
Net income applicable to common stock $ 4,424   $ 8,801    
Diluted weighted-average common shares outstanding before participating security 82,656,000   82,170,000    
Diluted EPS $ 0.05 $ (0.20) $ 0.11 $ (0.43)  
Calculation of basic ad diluted EPS:          
Net income $ 4,900 $ (15,348) $ 9,752 $ (34,041)  
Weighted-average common shares outstanding (in shares)   78,510   78,297  
Basic and Diluted EPS   $ (0.20)   $ (0.43)  
Series C Preferred Stock          
Earnings Per Share          
Preferred stock , shares outstanding (in shares) 8,624   8,624   8,624