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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net income loss available to common stockholders        
Net income $ 4,176 $ (12,180) $ 8,713 $ 53,091
Net income applicable to preferred stock 414   866 9,983
Net income applicable to common stock 3,762   7,847 43,108
Determination of shares:        
Weighted-average common shares outstanding (in shares) 78,458,000 78,306,436 78,189,000 77,932,000
Assumed conversion of dilutive employee stock-based awards (in shares) 1,800,000   1,903,000 3,058,000
Assumed conversion of restricted stock (in shares) 54,000   97,000 92,000
Diluted weighted-average common shares outstanding before participating security 80,312,000   80,189,000 81,082,000
Assumed conversion of preferred stock (in shares) 8,624,000   8,624,000 22,850,000
Diluted weighted-average common shares outstanding (in shares) 88,936,000   88,813,000 103,932,000
Anti-dilutive securities, options to purchase shares outstanding 935,147 10,638,637 935,147 99,625
Calculation of basic EPS:        
Net income applicable to common stock 3,762   7,847 43,108
Weighted-average common shares outstanding (in shares) 78,458,000 78,306,436 78,189,000 77,932,000
Basic earnings (loss) per common share (in dollars per share) $ 0.05 $ (0.16) $ 0.10 $ 0.55
Calculation of diluted EPS:        
Net income applicable to common stock $ 3,762   $ 7,847 $ 43,108
Diluted weighted-average common shares outstanding before participating security 80,312,000   80,189,000 81,082,000
Diluted earnings (loss) per common share (in dollars per share) $ 0.05 $ (0.16) $ 0.10 $ 0.51
Series C Preferred Stock [Member]
        
Earnings Per Share        
Preferred stock, shares outstanding 8,624   8,624  
Series B Preferred Stock [Member]
        
Earnings Per Share        
Preferred stock, shares outstanding 12,050   12,050