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Shareholders' Equity - Additional Information (Details) - USD ($)
12 Months Ended
Mar. 24, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 14, 2018
Jan. 01, 2013
Class Of Stock [Line Items]            
Common stock, voting rights   one vote per share        
Minimum % of REIT taxable income to be paid as dividend annually   90.00%       90.00%
Purchase of treasury shares   $ 9,771,000   $ 95,175,000    
Preferred stock, shares authorized (in shares)   30,000,000 30,000,000      
Preferred stock, shares outstanding (in shares)   0 0      
Life term of contract 5 years          
SACS            
Class Of Stock [Line Items]            
Life term of contract   25 years        
Percentage of Profit Share of Parent in Joint Venture   88.75%        
Percentage of Profit Share of Noncontrolling in Joint Venture   11.25%        
Amended Credit Agreement            
Class Of Stock [Line Items]            
Maximum borrowing capacity   $ 100,000,000.0        
Amended Credit Agreement | Revolving Credit Facility | Line of Credit            
Class Of Stock [Line Items]            
Maximum borrowing capacity         $ 900,000,000  
Common Stock | February2018 Stock Buy Back Program            
Class Of Stock [Line Items]            
Stock repurchase program, authorized amount         $ 200,000,000  
Purchase of treasury share   553,665 0 4,210,254    
Purchase of treasury shares   $ 9,000,000.0 $ 0 $ 95,200,000