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Shareholders' Equity (Details)
 12 Months Ended
Dec. 28, 2017
USD ($)
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Stockholders Equity Note Disclosure [Line Items]        
Common shares, shares authorized (up to) (in shares)   500,000,000 500,000,000  
Common shares, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01  
Number of votes per common share | vote   1    
Common shares, shares outstanding (in shares)   46,973,473 46,928,445  
Proceeds from issuance of common shares | $   $ 182,000 $ 7,298,000 $ 24,486,000
Preferred shares, shares authorized (up to) (in shares)   100,000,000 100,000,000  
Preferred shares, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01  
Preferred stock, shares outstanding (in shares)   0 0  
Vested operating partnership common units held by unaffiliated third parties (in shares)   654,603    
Operating partnership common units held by unaffiliated third parties (in shares)   102,048    
DRSP Plan        
Stockholders Equity Note Disclosure [Line Items]        
Stock purchase plan, authorized amount | $ $ 50,000,000      
Remaining authorized repurchase amount | $   $ 50,000,000.0    
New DRSPP        
Stockholders Equity Note Disclosure [Line Items]        
Additional common shares issued (in shares)   20,512    
Weighted average price per share (in dollars per share) | $ / shares   $ 8.89    
Proceeds from issuance of common shares | $   $ 200,000    
ATM Plan        
Stockholders Equity Note Disclosure [Line Items]        
Common shares, shares outstanding (in shares)   0    
Stock purchase plan, authorized amount | $ $ 100,000,000      
Remaining authorized repurchase amount | $   $ 100,000,000.0