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Stockholders' Equity - Preferred Stock (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 10, 2017
Class of Stock [Line Items]      
Preferred stock, shares outstanding (in shares) 57,464 65,464 39,466
Par value (in dollars per share) $ 575   $ 1,010,320
Preferred stock, liquidation preference $ 1,436,605 $ 1,636,605  
Series B      
Class of Stock [Line Items]      
Dividend Rate Per Annum 8.25%    
Preferred stock, shares outstanding (in shares) 6,114   13,999
Par value (in dollars per share) $ 61   $ 352,004
Preferred stock, liquidation preference $ 152,855    
Series E      
Class of Stock [Line Items]      
Dividend Rate Per Annum 8.75%    
Preferred stock, shares outstanding (in shares) 10,000   10,000
Par value (in dollars per share) $ 100   $ 259,542
Preferred stock, liquidation preference $ 250,000    
Series G      
Class of Stock [Line Items]      
Dividend Rate Per Annum 7.50%    
Preferred stock, shares outstanding (in shares) 3,450    
Par value (in dollars per share) $ 35    
Preferred stock, liquidation preference $ 86,250    
Series H      
Class of Stock [Line Items]      
Dividend Rate Per Annum 7.125%    
Preferred stock, shares outstanding (in shares) 11,500    
Par value (in dollars per share) $ 115    
Preferred stock, liquidation preference $ 287,500    
Series I      
Class of Stock [Line Items]      
Dividend Rate Per Annum 7.15%    
Preferred stock, shares outstanding (in shares) 13,800    
Par value (in dollars per share) $ 138    
Preferred stock, liquidation preference $ 345,000    
Series J      
Class of Stock [Line Items]      
Dividend Rate Per Annum 7.125%    
Preferred stock, shares outstanding (in shares) 12,600    
Par value (in dollars per share) $ 126    
Preferred stock, liquidation preference $ 315,000