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Summary of Revenues (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Number of Reportable Segments                 3    
Rental and related revenue $ 204,263 $ 206,848 $ 200,520 $ 201,803 $ 198,516 $ 200,938 $ 201,996 $ 214,615 $ 813,434 $ 816,065 $ 822,351
General contractor and service fee revenue (''Service Operations'') $ 20,264 $ 19,351 $ 26,044 $ 23,151 $ 23,047 $ 33,599 $ 23,901 $ 52,820 88,810 133,367 224,500
Total Segment Revenues                 902,244 949,432 1,046,851
Discontinued Operations                 983 32,549 120,884
Consolidated Revenue                 903,227 981,981 1,167,735
Operating Segments [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total Segment Revenues                 894,246 941,943 1,040,710
Operating Segments [Member] | Industrial [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 583,019 556,903 529,144
Operating Segments [Member] | Medical Office [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 175,437 160,951 146,530
Operating Segments [Member] | Other Segments [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 46,980 90,722 140,536
Operating Segments [Member] | Service Operations [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
General contractor and service fee revenue (''Service Operations'')                 88,810 133,367 224,500
Corporate, Non-Segment [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Rental and related revenue                 7,998 7,489 6,141
Discontinued Operations                 $ 983 $ 32,549 $ 120,884