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Summary of Revenues (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Number of Reportable Segments                 2    
Rental and related revenue $ 179,391 $ 169,611 $ 165,836 $ 171,676 $ 160,882 $ 162,322 $ 157,910 $ 160,587 $ 686,514 $ 641,701 $ 658,809
General contractor and service fee revenue (''Service Operations'') $ 36,228 $ 25,217 $ 23,576 $ 9,399 $ 20,264 $ 19,351 $ 26,044 $ 23,151 94,420 88,810 133,367
Total Segment Revenues                 780,934 730,511 792,176
Discontinued Operations                 87,185 172,716 189,805
Consolidated Revenue                 868,119 903,227 981,981
Operating Segments [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total Segment Revenues                 779,747 722,513 784,687
Operating Segments [Member] | Industrial [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 661,226 583,019 556,903
Operating Segments [Member] | Non-reportable segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 24,101 50,684 94,417
Operating Segments [Member] | Service Operations [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
General contractor and service fee revenue (''Service Operations'')                 94,420 88,810 133,367
Corporate, Non-Segment [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 1,187 7,998 7,489
Discontinued Operations                 $ 87,185 $ 172,716 $ 189,805