Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Redeemable Preferred Stock (Details)

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Stockholders' Equity Redeemable Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Class of Stock [Line Items]        
Shares issued and outstanding   40,050,000   29,050,000
Preferred stock carrying value   $ 977,501    
Preferred stock liquidation preference per share (in usd per share)   $ 25.00    
Number of shares of stock issued during period (in shares)     30,301  
Preferred stock par value per share (in usd per share)   $ 0.01   $ 0.01
Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued and outstanding   5,750,000    
Preferred stock carrying value   $ 138,872    
Preferred stock dividend rate   8.125%    
Preferred stock dividend variable rate spread   5.66%    
Series B Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued and outstanding   11,500,000    
Preferred stock carrying value   $ 278,094    
Preferred stock dividend rate   7.625%    
Preferred stock dividend variable rate spread   5.352%    
Series C Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued and outstanding   11,800,000    
Preferred stock carrying value   $ 285,584    
Preferred stock dividend rate   7.25%    
Preferred stock dividend variable rate spread   5.011%    
Series D Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued and outstanding   3,000,000    
Preferred stock carrying value   $ 74,964    
Preferred stock dividend rate   7.75%    
Number of shares of stock issued during period (in shares) 3,000,000      
Preferred stock par value per share (in usd per share)   $ 0.01    
Series E Preferred Stock [Member]        
Class of Stock [Line Items]        
Shares issued and outstanding   8,000,000    
Preferred stock carrying value   $ 199,987    
Preferred stock dividend rate   7.50%    
Number of shares of stock issued during period (in shares) 8,000,000      
Preferred stock par value per share (in usd per share)   $ 0.01