Real Estate (Tables)

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Information on the operating properties and land parcels the Company sold during the three and six months ended June 30, 2017 is as follows:

	Three Months Ended June 30, 2017					Six Months Ended June 30, 2017
	Number of Buildings	Acres of Developable Land	Leaseable Square Feet	Gross Proceeds (in thousands)		Number of Buildings	Acres of Developable Land	Leaseable Square Feet	Gross Proceeds (in thousands)
Chicago/Minneapolis	1	—	31,116	$	3,100	1	—	31,116	$	3,100
Florida	—	11	—	2,636		—	11	—	2,636
Houston	—	7	—	1,995		—	7	—	1,995
Philadelphia	—	2	—	6,904		—	2	—	6,904
Southeastern PA	1	3	62,386	6,975		2	3	95,413	9,050
Other	—	6	—	3,739		—	6	—	3,739
	2	29	93,502	$	25,349	3	29	126,529	$	27,424