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Common Shares (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
May 31, 2017
Feb. 18, 2021
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Treasury Stock, Shares, Acquired           3,222
Treasury Stock, Value, Acquired, Par Value Method           $ (253)
Number of common and preferred stock authorized to issue     185,000,000 185,000,000    
Common shares, authorized     175,000,000 175,000,000 175,000,000  
Preferred shares, authorized     10,000,000 10,000,000    
Common Stock, Shares, Outstanding     97,400,000 97,400,000    
Preferred Stock, Shares Outstanding     0 0    
Common shares issued       0 3,599 0
Proceeds from issuance of common shares       $ 0 $ 353,213 $ 0
Cash distributions declared to equity holders per share     $ 3.32 $ 3.32 $ 3.20 $ 3.08
2020 ATM program [Member]            
Maximum aggregate offering price of common shares       $ 362,700    
2017 ATM program [Member]            
Maximum aggregate offering price of common shares $ 315,300          
Common shares issued         200,000  
2019 Equity Offering [Member]            
Common shares issued       3,400,000    
Proceeds from issuance of common shares       $ 328,400    
Subsequent Event [Member]            
Cash distributions declared to equity holders per share   $ 0.83        
Maximum aggregate offering price of remaining common shares available for sale   $ 362,700        
April 2007 Repurchase Plan [Member]            
Stock Repurchase Program, Authorized Amount     $ 500,000 $ 500,000    
April 2007 Repurchase Plan [Member] | Subsequent Event [Member]            
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 269,500