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Dispositions (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
USD ($)
ft²
building
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gains on sales of operating properties   $ 7,169 $ 0 $ 7,169 $ 0
2829 Townsgate Road, Thousand Oaks, CA [Member] | Operating Properties [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of properties | building 1        
Rentable square feet | ft² 84,098        
Sales price $ 18,300