Stockholders' Equity and Partners' Capital - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended 47 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Class Of Stock [Line Items]        
Shares withheld for taxes   117,500    
Shares withheld for taxes, value   $ 4,400,000    
Forward sale agreements, shares of common stock 9,200,000      
Forward sale agreements, price per share $ 37.35      
Open forward sales agreements to be receive upon physical settlement, per share   $ 35.856 $ 35.856  
Preferred stock, shares outstanding   6,900,000 6,900,000 6,900,000
Dividend rate   6.00%    
Liquidation value (in USD per share)   $ 25.00 $ 25.00  
Dividend rate, quarterly basis (in USD per share)   0.375    
Dividend rate, annual basis (in USD per share)   $ 1.50    
Forward Sale Agreements        
Class Of Stock [Line Items]        
Issuance of common shares   2,800,000    
Gross proceeds from issuance of common stock   $ 106,200,000    
ATM Program November 2016        
Class Of Stock [Line Items]        
Issuance of common shares   400,000    
Gross proceeds from issuance of common stock   $ 17,900,000    
Common stock authorized   $ 500,000,000.0    
Common stock sold   700,000 5,900,000  
Gross proceeds capacity remaining   $ 234,800,000 $ 234,800,000  
ATM Program November 2016 | Weighted Average        
Class Of Stock [Line Items]        
Share issued during the period (in dollars per share)   $ 49.30    
ATM Program, Forward Sales        
Class Of Stock [Line Items]        
Common stock sold   700,000 4,100,000  
Number of remaining open forward sales agreements   300,000 300,000