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Summary of Significant Accounting Policies (Details 7) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income loss available to common stockholders                      
Net income (loss) $ (888,747,000) $ 41,317,000 $ (12,180,000) $ 65,271,000 $ 20,239,000 $ 46,446,000 $ 66,667,000 $ 78,619,000 $ (794,339,000) $ 211,971,000 $ 242,351,000
Net income applicable to preferred stock                   41,023,000 46,101,000
Net income applicable to common stock                 (794,339,000) 170,948,000 196,250,000
Determination of shares:                      
Weighted-average common shares outstanding (in shares)                 78,111,000 76,345,000 77,991,000
Assumed conversion of dilutive employee stock-based awards (in shares)                   2,305,000 1,616,000
Assumed conversion of restricted stock (in shares)                   159,000 166,000
Assumed conversion of preferred stock (in shares)                   24,995,000 27,278,000
Diluted weighted-average common shares outstanding (in shares)                 78,111,000 103,804,000 107,051,000
Anti-dilutive securities, options to purchase shares outstanding                 7,316,713 1,693,500 3,004,402
Calculation of basic EPS:                      
Net (loss) income applicable to common stock                 (794,339,000) 170,948,000 196,250,000
Weighted-average common shares outstanding (in shares)                 78,111,000 76,345,000 77,991,000
Basic earnings (loss) per common share (in dollars per share) $ (11.40) $ 0.43 $ (0.16) $ 0.68 $ 0.21 $ 0.49 $ 0.70 $ 0.83 $ (10.17) $ 2.24 $ 2.52
Calculation of diluted EPS:                      
Net (loss) income (888,747,000) 41,317,000 (12,180,000) 65,271,000 20,239,000 46,446,000 66,667,000 78,619,000 (794,339,000) 211,971,000 242,351,000
Diluted weighted-average common shares outstanding (in shares)                 78,111,000 103,804,000 107,051,000
Diluted earnings (loss) per common share (in dollars per share) $ (11.40) $ 0.40 $ (0.16) $ 0.63 $ 0.19 $ 0.44 $ 0.63 $ 0.74 $ (10.17) $ 2.04 $ 2.26
Series C Preferred Stock
                      
Earnings Per Share                      
Preferred stock, shares outstanding 8,624               8,624    
Series B Preferred Stock
                      
Earnings Per Share                      
Preferred stock, shares outstanding         12,275         12,275 12,275
Series B Preferred Stock | Common stock price less than $45
                      
Determination of shares:                      
Common stock price (in dollars per share) $ 45               $ 45    
Increase in diluted weighted-average common shares outstanding                 26,777,778    
Series B Preferred Stock | Common stock price between $45 and $67
                      
Determination of shares:                      
Aggregate liquidation preference of preferred stock $ 1,205,000,000               $ 1,205,000,000    
Series B Preferred Stock | Common stock price between $45 and $67 | Minimum
                      
Determination of shares:                      
Common stock price (in dollars per share) $ 45               $ 45    
Increase in diluted weighted-average common shares outstanding                 26,777,778    
Series B Preferred Stock | Common stock price between $45 and $67 | Maximum
                      
Determination of shares:                      
Common stock price (in dollars per share) $ 67               $ 67    
Increase in diluted weighted-average common shares outstanding                 17,985,075    
Series B Preferred Stock | Common stock price more than $67
                      
Determination of shares:                      
Common stock price (in dollars per share) $ 67               $ 67    
Increase in diluted weighted-average common shares outstanding                 17,985,075