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Accounting for the Impairment or Disposal of Long-Lived Assets (Asset Impairments in Reportable Segments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Asset impairment charges $ 39,688 $ 10,632 $ 3,879
Impairment - real estate assets 32,431 3,946 3,879
Florida      
Segment Reporting Information [Line Items]      
Asset impairment charges 2,396 0 0
Houston      
Segment Reporting Information [Line Items]      
Asset impairment charges 0 10,632 0
Chicago/Minneapolis      
Segment Reporting Information [Line Items]      
Asset impairment charges 2,456 0 3,879
Southeastern PA      
Segment Reporting Information [Line Items]      
Asset impairment charges 1,579 0 0
Other      
Segment Reporting Information [Line Items]      
Asset impairment charges 7,257 0 0
Philadelphia      
Segment Reporting Information [Line Items]      
Asset impairment charges 26,000 0 $ 0
Discontinued operations      
Segment Reporting Information [Line Items]      
Asset impairment charges 7,300 6,700  
Land and Land Improvements | impairment - real estate assets      
Segment Reporting Information [Line Items]      
Asset impairment charges 6,400 $ 3,900  
Land Held for Development | Philadelphia      
Segment Reporting Information [Line Items]      
Impairment - real estate assets $ 26,000