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Segment Reporting Summary of Revenues (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of Reportable Segments     3  
Rental and related revenue $ 206,848 $ 200,938 $ 609,171 $ 617,549
General contractor and service fee revenue 19,351 33,599 68,546 110,320
Revenues 226,199 234,537 677,717 727,869
Disposal Group, Including Discontinued Operation, Revenue 380 7 735 32,171
Total Revenues Including Revenues Related To Discontinued Operations 226,579 234,544 678,452 760,040
Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 224,515 233,063 670,694 722,027
Operating Segments [Member] | Industrial [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 149,746 136,276 432,945 419,391
Operating Segments [Member] | Medical Office [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 45,353 39,911 130,713 120,213
Operating Segments [Member] | All Other Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 10,065 23,277 38,490 72,103
Operating Segments [Member] | Service Operations [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
General contractor and service fee revenue 19,351 33,599 68,546 110,320
Corporate, Non-Segment [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 1,684 1,474 7,023 5,842
Disposal Group, Including Discontinued Operation, Revenue $ 380 $ 7 $ 735 $ 32,171