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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income loss available to common stockholders    
Net income $ 4,537 $ 65,271
Net income applicable to preferred stock 452 12,358
Net income applicable to common stock 4,085 52,913
Determination of shares:    
Weighted-average common shares outstanding (in shares) 77,917,000 77,553,000
Assumed conversion of dilutive employee stock-based awards (in shares) 2,003,000 2,940,000
Assumed conversion of restricted stock (in shares) 135,000 99,000
Diluted weighted-average common shares outstanding before participating security 80,055,000 80,592,000
Assumed conversion of preferred stock (in shares) 8,624,000 22,295,000
Diluted weighted-average common shares outstanding (in shares) 88,679,000 102,887,000
Anti-dilutive securities, options to purchase shares outstanding 942,147 235,125
Calculation of basic EPS:    
Net income applicable to common stock 4,085 52,913
Weighted-average common shares outstanding (in shares) 77,917,000 77,553,000
Basic earnings per common share (in dollars per share) $ 0.05 $ 0.68
Calculation of diluted EPS:    
Net income applicable to common stock 4,085 52,913
Net income $ 4,537 $ 65,271
Diluted weighted-average common shares outstanding before participating security 80,055,000 80,592,000
Diluted weighted-average common shares outstanding (in shares) 88,679,000 102,887,000
Diluted earnings per common share (in dollars per share) $ 0.05 $ 0.63
Series C Preferred Stock
    
Earnings Per Share    
Preferred stock, shares outstanding 8,624  
Series B Preferred Stock
    
Earnings Per Share    
Preferred stock, shares outstanding   12,050