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Segment Reporting Summary of Revenues (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of Reportable Segments     4  
Rental and related revenue $ 200,938 $ 202,067 $ 617,549 $ 615,493
General contractor and service fee revenue 33,599 59,739 110,320 185,072
Revenues 234,537 261,806 727,869 800,565
Disposal Group, Including Discontinued Operation, Revenue 7 29,709 32,171 89,112
Total Revenues Including Revenues Related To Discontinued Operations 234,544 291,515 760,040 889,677
Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 233,063 260,781 722,027 797,213
Operating Segments [Member] | Industrial [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 136,276 130,495 419,391 392,048
Operating Segments [Member] | Medical Office [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 39,911 36,715 120,213 104,979
Operating Segments [Member] | Office [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 23,277 32,134 72,103 109,700
Operating Segments [Member] | All Other Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 0 1,698 0 5,414
Operating Segments [Member] | Service Operations [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
General contractor and service fee revenue 33,599 59,739 110,320 185,072
Corporate, Non-Segment [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 1,474 1,025 5,842 3,352
Disposal Group, Including Discontinued Operation, Revenue $ 7 $ 29,709 $ 32,171 $ 89,112