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Summary of Revenues (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Number of Reportable Segments                 2    
Rental and related revenue $ 217,387 $ 215,374 $ 213,107 $ 209,965 $ 202,858 $ 196,912 $ 192,093 $ 193,456 $ 855,833 $ 785,319 $ 686,514
General contractor and service fee revenue (''Service Operations'') $ 13,088 $ 25,955 $ 23,919 $ 54,964 $ 67,999 $ 34,986 $ 18,465 $ 41,101 117,926 162,551 94,420
Total Segment Revenues                 973,759 947,870 780,934
Discontinued Operations                 0 117 87,185
Consolidated Revenue                 973,759 947,987 868,119
Expense impact of costs attributable to successful leasing activities                 12,402 0 0
Operating Segments [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total Segment Revenues                 972,526 946,126 779,747
Operating Segments [Member] | Industrial [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 848,806 775,713 661,226
Operating Segments [Member] | Non-reportable segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 5,794 7,862 24,101
Operating Segments [Member] | Service Operations [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
General contractor and service fee revenue (''Service Operations'')                 117,926 162,551 94,420
Corporate, Non-Segment [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 1,233 1,744 1,187
Discontinued Operations                 0 117 87,185
Expense impact of costs attributable to successful leasing activities                 $ (12,402) $ 0 $ 0