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Segment Reporting Summary of Revenues (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]    
Number of Reportable Segments 3  
Rental and related revenue $ 217,915 $ 201,803
General contractor and service fee revenue 9,399 23,151
Revenues 227,314 224,954
Disposal Group, Including Discontinued Operation, Revenue 0 229
Total Revenues Including Revenues Related To Discontinued Operations 227,314 225,183
Operating Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 226,936 223,252
Operating Segments [Member] | Industrial [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 156,882 142,980
Operating Segments [Member] | Medical Office [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 47,522 42,225
Operating Segments [Member] | All Other Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 13,133 14,896
Operating Segments [Member] | Service Operations [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
General contractor and service fee revenue 9,399 23,151
Corporate, Non-Segment [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 378 1,702
Disposal Group, Including Discontinued Operation, Revenue $ 0 $ 229