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Equity - Preferred Stock (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jul. 26, 2018
Dec. 31, 2017
Feb. 28, 2017
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Class of Stock [Line Items]              
Issuance of shares         $ 133,805,000    
Preferred shares outstanding (in shares)         0   0
Preferred stock, dividend rate     6.00%        
Preferred stock, cash dividend         $ 11,300,000 $ 0  
Preferred stock, cumulative dividends   $ 18,000,000          
Preferred stock, cumulative dividends (in dollars per share)   $ 0.51          
Cumulative preferred in-kind dividend per share (in dollars per share)         $ 0.050907    
Preferred share dividend (in shares)         1,825,000    
Preferred stock, dividends declared (in dollars per share)         $ 0.308    
Conversion of Series A preferred stock into common stock         $ 0    
Series A Preferred Stock              
Class of Stock [Line Items]              
Issuance of shares (in shares)     35,845,001        
Issuance of shares     $ 335,000,000        
Conversion of Series A preferred stock into common stock         (335,000,000)    
Additional Paid-in Capital              
Class of Stock [Line Items]              
Issuance of shares         133,795,000    
Conversion of Series A preferred stock into common stock     $ 27,000,000   $ 334,960,000    
Conversion of Series A to Common Shares              
Class of Stock [Line Items]              
Number of shares converted (in shares) 37,700,000     37,700,000      
Common shares issued on conversion (in shares) 39,600,000     39,600,000