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Capital Stock - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]                        
Preferred stock, par value (usd per share)   $ 0.01       $ 0.01       $ 0.01 $ 0.01  
Issuance of preferred stock                   $ 193,368 $ 251,536 $ 314,429
Dividends on preferred stock   $ 18,438 $ 18,438 $ 18,438 $ 17,392 $ 14,437 $ 9,960 $ 9,400 $ 9,400 $ 72,704 $ 43,197 $ 33,484
Series D Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued (shares) 8,000,000                      
Preferred stock, dividend rate (percent) 8.00%                 8.00% 8.00%  
Preferred stock, par value (usd per share) $ 0.01                      
Preferred stock, offering price per share (in USD per share) $ 25.00                      
Issuance of preferred stock $ 193,000                      
Preferred stock, redemption price per share (in USD per share) $ 25.00                      
Preferred stock, liquidation preference per share (in USD per share) 25.00                      
Fixed annual rate (in USD per share) $ 2.00                      
Dividends on preferred stock                   $ 15,000    
Preferred stock dividends declared (in USD per share)                   $ 1.87    
Series A Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock, dividend rate (percent)                   8.00% 8.00%  
Dividends on preferred stock                   $ 12,000 $ 12,000  
Preferred stock dividends declared (in USD per share)                   $ 2.00 $ 2.00  
Series B Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock, dividend rate (percent)                   8.00% 8.00%  
Dividends on preferred stock                   $ 26,000 $ 26,000  
Preferred stock dividends declared (in USD per share)                   $ 2.00 $ 2.00  
Series C Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock, dividend rate (percent)                   7.75% 7.75%  
Dividends on preferred stock                   $ 20,000 $ 6,000  
Preferred stock dividends declared (in USD per share)                   $ 1.94 $ 0.54  
LIBOR | Series D Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock, basis spread on variable rate 5.379%