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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Net income loss available to common stockholders      
Net income $ 1,869 $ 580  
Net income applicable to preferred stock 183 58  
Net income applicable to common stock $ 1,686 $ 522  
Determination of shares:      
Weighted-average common shares outstanding (in shares) 79,400,000 77,917,000  
Assumed conversion of dilutive employee stock-based awards (in shares) 2,296,000 2,003,000  
Assumed conversion of restricted stock (in shares) 72,000 135,000  
Diluted weighted-average common shares outstanding before participating security 81,768,000 80,055,000  
Assumed conversion of preferred stock (in shares) 8,624,000 8,624,000  
Diluted weighted-average common shares outstanding (in shares) 90,392,000 88,679,000  
Anti-dilutive securities, options to purchase shares outstanding 1,561,562 392,289  
Calculation of basic EPS:      
Net income applicable to common stock $ 1,686 $ 522  
Weighted-average common shares outstanding (in shares) 79,400,000 77,917,000  
Basic earnings per common share (in dollars per share) $ 0.02 $ 0.01  
Calculation of diluted EPS using two-class method:      
Net income applicable to common stock $ 1,686 $ 522  
Diluted weighted-average common shares outstanding before participating security 81,768,000 80,055,000  
Diluted earnings per common share (in dollars per share) $ 0.02 $ 0.01  
Series C Preferred Stock      
Earnings Per Share      
Preferred stock , shares outstanding 8,624 8,624 8,624