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Segment Information (Operating Revenues by Segment and Type) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from External Customer [Line Items]                      
Total revenue $ 180,281 $ 170,389 $ 174,091 $ 180,128 $ 179,825 $ 170,783 $ 160,747 $ 154,029 $ 704,889 $ 665,384 $ 675,323
Operating Segments                      
Revenue from External Customer [Line Items]                      
Total revenue                 687,851 671,280 734,050
Operating Segments | Carolinas/Richmond                      
Revenue from External Customer [Line Items]                      
Total revenue                 79,271 74,158 66,270
Operating Segments | Chicago/Minneapolis                      
Revenue from External Customer [Line Items]                      
Total revenue                 67,551 64,706 84,028
Operating Segments | Florida                      
Revenue from External Customer [Line Items]                      
Total revenue                 64,486 59,526 99,733
Operating Segments | Houston                      
Revenue from External Customer [Line Items]                      
Total revenue                 64,968 59,957 59,582
Operating Segments | Lehigh/Central PA                      
Revenue from External Customer [Line Items]                      
Total revenue                 156,629 163,026 141,046
Operating Segments | Philadelphia                      
Revenue from External Customer [Line Items]                      
Total revenue                 44,387 45,504 41,838
Operating Segments | Southeastern PA                      
Revenue from External Customer [Line Items]                      
Total revenue                 27,874 59,762 91,656
Operating Segments | Southern California                      
Revenue from External Customer [Line Items]                      
Total revenue                 30,939 13,856 11,019
Operating Segments | United Kingdom                      
Revenue from External Customer [Line Items]                      
Total revenue                 17,193 13,917 13,376
Operating Segments | Other                      
Revenue from External Customer [Line Items]                      
Total revenue                 134,553 116,868 125,502
Segment Reconciling Items | Development service fee income                      
Revenue from External Customer [Line Items]                      
Total revenue                 73,224 82,673 12,941
Segment Reconciling Items | Discontinued operations                      
Revenue from External Customer [Line Items]                      
Total revenue                 (56,056) (88,429) (71,385)
Corporate, Non-Segment                      
Revenue from External Customer [Line Items]                      
Total revenue                 (130) (140) (283)
Industrial Property | Operating Segments                      
Revenue from External Customer [Line Items]                      
Total revenue                 592,363 547,204 529,268
Industrial Property | Operating Segments | Carolinas/Richmond                      
Revenue from External Customer [Line Items]                      
Total revenue                 79,271 74,158 66,270
Industrial Property | Operating Segments | Chicago/Minneapolis                      
Revenue from External Customer [Line Items]                      
Total revenue                 63,393 60,826 65,007
Industrial Property | Operating Segments | Florida                      
Revenue from External Customer [Line Items]                      
Total revenue                 61,878 56,923 66,028
Industrial Property | Operating Segments | Houston                      
Revenue from External Customer [Line Items]                      
Total revenue                 64,968 58,606 58,370
Industrial Property | Operating Segments | Lehigh/Central PA                      
Revenue from External Customer [Line Items]                      
Total revenue                 156,629 163,026 138,766
Industrial Property | Operating Segments | Philadelphia                      
Revenue from External Customer [Line Items]                      
Total revenue                 11,923 11,914 12,842
Industrial Property | Operating Segments | Southeastern PA                      
Revenue from External Customer [Line Items]                      
Total revenue                 4,139 8,925 19,448
Industrial Property | Operating Segments | Southern California                      
Revenue from External Customer [Line Items]                      
Total revenue                 30,939 13,856 11,019
Industrial Property | Operating Segments | United Kingdom                      
Revenue from External Customer [Line Items]                      
Total revenue                 13,601 10,369 10,775
Industrial Property | Operating Segments | Other                      
Revenue from External Customer [Line Items]                      
Total revenue                 105,622 88,601 80,743
Office properties | Operating Segments                      
Revenue from External Customer [Line Items]                      
Total revenue                 95,488 124,076 204,782
Office properties | Operating Segments | Carolinas/Richmond                      
Revenue from External Customer [Line Items]                      
Total revenue                 0 0 0
Office properties | Operating Segments | Chicago/Minneapolis                      
Revenue from External Customer [Line Items]                      
Total revenue                 4,158 3,880 19,021
Office properties | Operating Segments | Florida                      
Revenue from External Customer [Line Items]                      
Total revenue                 2,608 2,603 33,705
Office properties | Operating Segments | Houston                      
Revenue from External Customer [Line Items]                      
Total revenue                 0 1,351 1,212
Office properties | Operating Segments | Lehigh/Central PA                      
Revenue from External Customer [Line Items]                      
Total revenue                 0 0 2,280
Office properties | Operating Segments | Philadelphia                      
Revenue from External Customer [Line Items]                      
Total revenue                 32,464 33,590 28,996
Office properties | Operating Segments | Southeastern PA                      
Revenue from External Customer [Line Items]                      
Total revenue                 23,735 50,837 72,208
Office properties | Operating Segments | Southern California                      
Revenue from External Customer [Line Items]                      
Total revenue                 0 0 0
Office properties | Operating Segments | United Kingdom                      
Revenue from External Customer [Line Items]                      
Total revenue                 3,592 3,548 2,601
Office properties | Operating Segments | Other                      
Revenue from External Customer [Line Items]                      
Total revenue                 $ 28,931 $ 28,267 $ 44,759