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Shareholders' Equity (Details)
1 Months Ended 12 Months Ended
Dec. 28, 2017
USD ($)
Jan. 31, 2014
USD ($)
Dec. 31, 2019
USD ($)
vote
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
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)     46,928,445 46,537,031  
Proceeds from issuance of common shares | $     $ 7,298,000 $ 24,486,000 $ 150,691,000
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  
Operating partnership common units held by unaffiliated third parties (in shares)     0 0  
DRSP Plan          
Stockholders Equity Note Disclosure [Line Items]          
Stock purchase plan, authorized amount | $ $ 50,000,000 $ 25,000,000      
Additional common shares issued (in shares)     1,768,000 1,508,046  
Weighted average price per share (in dollars per share) | $ / shares     $ 21.33 $ 21.55  
Remaining authorized repurchase amount | $     $ 27,900,000    
New DRSPP          
Stockholders Equity Note Disclosure [Line Items]          
Additional common shares issued (in shares)     259,954    
Weighted average price per share (in dollars per share) | $ / shares     $ 20.09    
Proceeds from issuance of common shares | $     $ 5,200,000    
ATM Plan          
Stockholders Equity Note Disclosure [Line Items]          
Common shares, shares outstanding (in shares)     103,590    
Stock purchase plan, authorized amount | $ $ 100,000,000 $ 50,000,000      
Additional common shares issued (in shares)     2,602,260 2,498,670  
Weighted average price per share (in dollars per share) | $ / shares     $ 21.76 $ 21.83  
Proceeds from issuance of common shares | $     $ 2,100,000    
Remaining authorized repurchase amount | $     $ 90,400,000    
Weighted average price per issued share (in dollars per share) | $ / shares     $ 20.05