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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Feb. 28, 2018
Class of Stock [Line Items]                
Shares of common stock (in shares)   7,000,000            
Average price per share (in dollars per share)   $ 56.50 $ 56.50   $ 56.50      
Net proceeds   $ 379,410            
Stock issuance costs   $ 16,090     $ 17,274 $ 2,908    
Total allowable shares (in shares)   375,000,000 375,000,000   375,000,000   375,000,000  
Net proceeds         $ 539,318 220,524    
Total shares issued (in shares)   171,637,247 171,637,247   171,637,247   161,503,585  
Common stock dividends     $ 83,935 $ 78,253 $ 245,574 $ 223,836    
Common stock dividends per share (in dollars per share)     $ 0.515 $ 0.500 $ 1.515 $ 1.450    
Common stock dividends declared (in dollars per share)     $ 0.515 $ 0.50 $ 1.515 $ 1.45    
Subsequent event                
Class of Stock [Line Items]                
Common stock dividends declared (in dollars per share) $ 0.515              
Series E Preferred Stock                
Class of Stock [Line Items]                
Preferred stock dividends     $ 4,097 $ 4,097 $ 12,291 $ 12,291    
Preferred stock dividends per depositary share (in dollars per share)     $ 0.356250 $ 0.356250 $ 1.068750 $ 1.068750    
Dividend rate         5.70%   5.70%  
Series F Preferred Stock                
Class of Stock [Line Items]                
Preferred stock dividends     $ 4,485 $ 4,485 $ 13,455 $ 13,455    
Preferred stock dividends per depositary share (in dollars per share)     $ 0.325000 $ 0.325000 $ 0.975000 $ 0.975000    
Dividend rate         5.20%   5.20%  
DRIP                
Class of Stock [Line Items]                
Total allowable shares (in shares)               10,000,000
Shares of common stock (in shares)     309,127 225,481        
Net proceeds     $ 16,481 $ 9,115        
ATM equity program                
Class of Stock [Line Items]                
Shares of common stock (in shares)         2,344,022 4,896,563    
Average price per share (in dollars per share)   $ 53.73 $ 53.73 $ 42.60 $ 53.73 $ 42.60    
Net proceeds         $ 125,946 $ 208,579    
Stock issuance costs         $ 1,390 $ 2,792    
Total allowable shares (in shares)   12,000,000 12,000,000   12,000,000      
Total shares issued (in shares)   9,722,185 9,722,185   9,722,185