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Related-Party Transactions Property Manager Fees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party $ 5,454 $ 0 $ 0
Property Manager      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party $ 22,631 24,384 23,074
Accounts payable, related parties   2,506  
Property Management Fees | Property Manager      
Related Party Transaction [Line Items]      
Property management fee, percent fee 4.00%    
Related party transaction, expenses from transactions with related party $ 8,360 9,929 9,108
Accounts payable, related parties   840  
Leasing Commissions | Property Manager      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 6,670 7,701 7,316
Accounts payable, related parties   705  
Construction Management Fees | Property Manager      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 1,367 1,127 1,117
Accounts payable, related parties   165  
Expenses and Reimbursements | Property Manager      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party $ 6,234 5,627 $ 5,533
Accounts payable, related parties   $ 796