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Related Party Transactions (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
nonemployeedirectors
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
May 17, 2016
shares
May 20, 2014
shares
Related Party Transaction [Line Items]          
Number Of Non Employee Directors Electing To Receive Deferred Stock Units | nonemployeedirectors 6        
Shares issued | shares 153,869,075 153,658,866   1,507 7,542
Deferred Stock Units Outstanding 99,035 93,044      
Executive Vice President and New York regional manager [Member]          
Related Party Transaction [Line Items]          
Aggregate leasing commissions paid to related parties $ 315,000 $ 616,000 $ 1,214,000    
Brother of Senior Executive Vice President [Member]          
Related Party Transaction [Line Items]          
Aggregate leasing commissions paid to related parties $ 374,000 $ 384,000 $ 674,000