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Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Aug. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
Nov. 29, 2012
right
Common Stock                
Shares authorized (in shares)     800,000,000 1,800,000,000.0 1,800,000,000 800,000,000    
Preferred stock, shares authorized (in shares)     50,000,000 50,000,000 50,000,000 50,000,000    
Common stock issued for debt (in shares)         92,800,000      
Shares repurchased then retired during period (in shares)           27,400,000    
Shares repurchased then retired during period, value | $           $ 111,300,000    
Broker fees and commission for shares repurchased, then retired | $           500,000    
Additional paid-in capital—stockholder receivable | $     $ 2,500,000   $ 1,250,000 2,500,000    
2014 Share Repurchase Program                
Common Stock                
Share repurchase program, maximum authorized amount | $     $ 200,000,000.0     $ 200,000,000.0    
6.0% Convertible perpetual preferred stock                
Preferred Stock                
Preferred stock, dividend rate, percentage           6.00% 6.00%  
Shares of common stock issued related to conversion of preferred stock (in shares)     18,400,000          
Series A Junior Participating Preferred Stock | Stockholder Rights Plan                
Common Stock                
Number of Rights issued per common share | right               1
Common Stock and Preferred Stock                
Common Stock                
Shares authorized     850,000,000 1,850,000,000   850,000,000    
Shares authorized, par value (usd per share) | $ / shares     $ 0.001 $ 0.001   $ 0.001    
Common Stock                
Preferred Stock                
Shares of common stock issued related to conversion of preferred stock (in shares)         2,968,000 18,423,000    
Common Stock                
Common stock issued for debt (in shares)         120,881,000      
Senior Notes                
Common Stock                
Debt conversion, original debt, amount | $ $ 300,000,000 $ 275,000,000            
Senior Notes | Common Stock                
Common Stock                
Common stock issued for debt (in shares)         28,000,000      
Convertible Debt                
Common Stock                
Debt conversion, original debt, amount | $         $ 255,300,000      
Convertible Debt | Common Stock                
Common Stock                
Common stock issued for debt (in shares)         92,800,000      
7.5% Senior Notes Due 2021 And 8.125% Senior Notes Due 2022 | Senior Notes                
Common Stock                
Common stock issued for debt (in shares)       28,000,000        
Debt conversion, original debt, amount | $         $ 50,000,000