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Summary of Significant Accounting Policies (Details 7) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income loss available to common stockholders                      
Net income $ (149,781) $ (15,348) $ (19,273) $ 580 $ (674,556) $ 40,949 $ (12,548) $ 64,903 $ (183,822) $ (581,252) $ 210,497
Net income applicable to preferred stock                     40,738
Net income applicable to common stock                     $ 169,759
Determination of shares:                      
Basic shares outstanding                 78,425,000 78,111,000 76,345,000
Assumed conversion of dilutive employee stock-based awards (in shares)                     2,305,000
Assumed conversion of restricted stock (in shares)                     159,000
Assumed conversion of preferred stock (in shares)                     24,995,000
Diluted weighted-average common shares outstanding (in shares)                 78,425,000 78,111,000 103,804,000
Anti-dilutive securities, options to purchase shares outstanding                 6,633,622 7,316,713 1,693,500
Calculation of basic EPS:                      
Net income from continuing operations applicable to common stock                     $ 151,276
Weighted-average common shares outstanding                 78,425,000 78,111,000 76,345,000
Basic earnings per common share (in dollar per share)         $ (8.66) $ 0.40 $ (0.22) $ 0.64 $ (2.34) $ (7.59) $ 1.98
Calculation of basic EPS:                      
Net income from discontinued operations applicable to common stock                     $ 18,483
Weighted-average common shares outstanding                 78,425,000 78,111,000 76,345,000
Basic income earnings per common (in dollars per share)         $ 0.01 $ 0.03 $ 0.06 $ 0.03   $ 0.15 $ 0.24
Calculation of diluted EPS using if-converted method:                      
Net income from continuing operations         $ (675,507) $ 38,268 $ (17,247) $ 61,689 $ (183,822) $ (592,797) $ 187,578
Diluted weighted-average common shares outstanding                 78,425,000 78,111,000 103,804,000
Diluted earnings per common shares (in dollar per share)         $ (8.66) $ 0.37 $ (0.22) $ 0.60 $ (2.34) $ (7.59) $ 1.81
Calculation of diluted EPS using if-converted method:                      
Net income from discontinued operations                   $ 11,545 $ 22,919
Diluted weighted-average common shares outstanding                 78,425,000 78,111,000 103,804,000
Diluted earnings per share (in dollars per share)         $ 0.01 $ 0.03 $ 0.06 $ 0.03   $ 0.15 $ 0.22
Series C Preferred Stock                      
Earnings Per Share                      
Preferred stock, shares outstanding 8,624       8,624       8,624 8,624  
Series B Preferred Stock                      
Earnings Per Share                      
Preferred stock, shares outstanding 0       0       0 0 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               $ 1,205,000    
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                 17,985,075    
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                 26,777,778    
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