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Summary of Revenues (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]      
Number of Reportable Segments 2    
Rental and related revenue $ 929,194 $ 855,833 $ 785,319
General contractor and service fee revenue (''Service Operations'') 64,004 117,926 162,551
Total Segment Revenues 993,198 973,759 947,870
Consolidated Revenue $ 993,198 973,759 947,987
Major Customer      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Concentration Risk, Percentage 10.00%    
Operating Segments [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total Segment Revenues $ 991,611 972,526 946,126
Operating Segments [Member] | Industrial Operations      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Rental and related revenue 921,612 848,806 775,713
Operating Segments [Member] | Industrial Operations | Major Customer      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Rental and related revenue 92,986 63,805 56,649
Operating Segments [Member] | Non-reportable segments      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Rental and related revenue 5,995 5,794 7,862
Operating Segments [Member] | Service Operations [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
General contractor and service fee revenue (''Service Operations'') 64,004 117,926 162,551
Operating Segments [Member] | Service Operations [Member] | Major Customer      
Segment Reporting, Revenue Reconciling Item [Line Items]      
General contractor and service fee revenue (''Service Operations'') 32,771 45,177 44,532
Corporate, Non-Segment [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Rental and related revenue 1,587 1,233 1,744
Discontinued Operations $ 0 $ 0 $ 117