Area of land held.

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- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Net rentable area for properties owned.

+ References

No definition available.

+ Details

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Assets Held for Sale (Details) $ in Thousands	3 Months Ended	9 Months Ended
Assets Held for Sale (Details) $ in Thousands	Sep. 30, 2017 USD ($) a bldg	Sep. 30, 2017 USD ($) a bldg	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Assets Held for Sale [Line Items]
Gross Proceeds		$ 56,474	$ 142,808
Assets held for sale	$ 177,549	$ 177,549		$ 4,548
Lehigh Central PA [Member] \| 2017 held for sale [Member] \| Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets Held for Sale [Line Items]
Gross Proceeds	$ 249,000
Number of Real Estate Properties \| bldg	2	2
Leaseable square feet \| a	1,700,000	1,700,000
Acres of developable land \| a	44	44
Chicago Minneapolis [Member] \| 2017 held for sale [Member] \| Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets Held for Sale [Line Items]
Acres of developable land \| a	9	9
Land, Buildings and Improvements [Member] \| Lehigh Central PA [Member] \| 2017 held for sale [Member] \| Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets Held for Sale [Line Items]
Assets held for sale	$ 176,400	$ 176,400
Land and Land Improvements [Member] \| Chicago Minneapolis [Member] \| 2017 held for sale [Member] \| Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets Held for Sale [Line Items]
Assets held for sale	$ 1,100	$ 1,100