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New Issued Accounting Pronouncements (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2019
USD ($)
capital_lease
administrative_office
center
Sep. 30, 2019
USD ($)
center
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
center
Sep. 30, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Real estate taxes, net   $ 15,205 $ 17,601 $ 47,072 $ 52,706
Number of properties with ground lease agreements | center 12        
Number of administrative office leases | administrative_office 4        
Number of finance leases | capital_lease 1        
Finance lease assets, number of units, centers | center 2 2   2  
Finance lease obligations $ 21,900 $ 21,828   $ 21,828  
Operating leases, liabilities   $ 43,100   $ 43,100  
Accounting Standards Update 2016-02 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease, right-of-use asset 44,200        
Operating leases, liabilities $ 42,900        
Lease Arrangement, Lessor [Member] | Accounting Standards Update 2016-02 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Real estate taxes, net     $ 1,100   $ 3,300