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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Net income loss available to common stockholders      
Net income $ 23,708 $ 1,869  
Net income applicable to preferred stock 2,282 183  
Net income applicable to common stock $ 21,426 $ 1,686  
Determination of shares:      
Weighted-average common shares outstanding (in shares) 80,968,000 79,400,000  
Assumed conversion of dilutive employee stock-based awards (in shares) 1,448,000 2,296,000  
Assumed conversion of restricted stock (in shares) 51,000 72,000  
Diluted weighted-average common shares outstanding before participating security 82,467,000 81,768,000  
Assumed conversion of preferred stock (in shares) 8,624,000 8,624,000  
Diluted weighted-average common shares outstanding (in shares) 91,091,000 90,392,000  
Anti-dilutive securities, options to purchase shares outstanding 2,574,719 1,561,562  
Calculation of basic EPS:      
Net income applicable to common stock $ 21,426 $ 1,686  
Weighted-average common shares outstanding (in shares) 80,968,000 79,400,000  
Basic EPS (in dollars per share) $ 0.26 $ 0.02  
Calculation of diluted EPS using two class method:      
Net income applicable to common stock $ 21,426 $ 1,686  
Diluted weighted-average common shares outstanding before participating security 82,467,000 81,768,000  
Diluted EPS (in dollars per share) $ 0.26 $ 0.02  
Series C Preferred Stock      
Earnings Per Share      
Preferred stock, shares outstanding 8,624 8,624 8,624