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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net income loss available to common stockholders        
Net income $ 16,886 $ 4,176 $ 27,882 $ 8,713
Net income applicable to preferred stock 1,648 414 2,726 866
Net income applicable to common stock $ 15,238 $ 3,762 $ 25,156 $ 7,847
Determination of shares:        
Weighted-average common shares outstanding (in shares) 79,758,000 78,458,000 79,580,000 78,189,000
Assumed conversion of dilutive employee stock-based awards (in shares) 2,298,000 1,800,000 2,301,000 1,903,000
Assumed conversion of restricted stock (in shares) 49,000 54,000 60,000 97,000
Diluted weighted-average common shares outstanding before participating security 82,105,000 80,312,000 81,941,000 80,189,000
Assumed conversion of preferred stock (in shares) 8,624,000 8,624,000 8,624,000 8,624,000
Diluted weighted-average common shares outstanding (in shares) 90,729,000 88,936,000 90,565,000 88,813,000
Anti-dilutive securities, options to purchase shares outstanding     1,604,583 935,147
Calculation of basic EPS:        
Net income applicable to common stock $ 15,238 $ 3,762 $ 25,156 $ 7,847
Weighted-average common shares outstanding (in shares) 79,758,000 78,458,000 79,580,000 78,189,000
Basic earnings per common share (in dollars per share) $ 0.19 $ 0.05 $ 0.32 $ 0.10
Calculation of diluted EPS using two-class method:        
Net income applicable to common stock $ 15,238 $ 3,762 $ 25,156 $ 7,847
Diluted weighted-average common shares outstanding before participating security 82,105,000 80,312,000 81,941,000 80,189,000
Diluted earnings per common share (in dollars per share) $ 0.19 $ 0.05 $ 0.31 $ 0.10
Series C Preferred Stock        
Earnings Per Share        
Preferred stock , shares outstanding 8,624 8,624 8,624 8,624