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Segment Reporting Summary of Revenues (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]    
Number of Reportable Segments 3  
Rental and related revenue $ 201,803 $ 214,615
General contractor and service fee revenue 23,151 52,820
Revenues 224,954 267,435
Disposal Group, Including Discontinued Operation, Revenue 229 32,115
Total Revenues Including Revenues Related To Discontinued Operations 225,183 299,550
Operating Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 223,252 265,611
Operating Segments [Member] | Industrial [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 142,980 147,227
Operating Segments [Member] | Medical Office [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 42,225 40,028
Operating Segments [Member] | All Other Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 14,896 25,536
Operating Segments [Member] | Service Operations [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
General contractor and service fee revenue 23,151 52,820
Corporate, Non-Segment [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Rental and related revenue 1,702 1,824
Disposal Group, Including Discontinued Operation, Revenue $ 229 $ 32,115