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Related Party Transactions (Details)
12 Months Ended
Sep. 03, 2019
shares
Dec. 31, 2019
USD ($)
nonemployeedirectors
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
May 21, 2019
shares
May 23, 2018
shares
Related Party Transaction [Line Items]            
Number Of Non Employee Directors Electing To Receive Deferred Stock Units | nonemployeedirectors   7        
Shares issued | shares   154,869,198 154,537,378      
Deferred Stock Units Outstanding   60,676 74,966      
Separate Unrestricted Cash For Deferred Compensation Plans   $ 36,700,000 $ 28,200,000      
Company's liability for Directors   377,553,000 276,645,000      
Brother of Senior Executive Vice President [Member]            
Related Party Transaction [Line Items]            
Aggregate leasing commissions paid to related parties   21,000 $ 921,000 $ 368,000    
deferred compenstation for directors [Member]            
Related Party Transaction [Line Items]            
Separate Unrestricted Cash For Deferred Compensation Plans   700,000        
Company's liability for Directors   $ 700,000        
Director Cessation [Member]            
Related Party Transaction [Line Items]            
Shares issued | shares         17,949 36,836
Common Stock converted (Shares) | shares 4,917