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Stockholders' Equity Stockholders' Equity Mandatory Convertible Preferred Stock (Details) - $ / shares
 6 Months Ended 12 Months Ended
Apr. 20, 2016
Oct. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Class of Stock [Line Items]          
Depositary Share Offering   32,000,000      
Issuances of common shares       62,000,000  
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference     9.75%   9.75%
Preferred Stock, Liquidation Preference Per Share     $ 1,000   $ 1,000
Depositary Shares, Liquidation Preference Per Share   $ 50      
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference          
Class of Stock [Line Items]          
Issuances of common shares   1,600,000      
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference   9.75%      
Preferred Stock, Liquidation Preference Per Share   $ 1,000      
Preferred Stock, Dividends Per Share, Declared $ 24.375        
Depositary Stock, Dividends Per Share, Declared $ 1.21875