Investments in Unconsolidated Joint Ventures (Other Joint Ventures) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) ft² a bldg investment properties	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of properties \| bldg	37
Acres of developable land \| a	9
Philadelphia [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Building and Building Improvements [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Building and Building Improvements [Member] \| Orlando [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Number of equity method investments \| investment	3
Number of properties \| properties	7
Building and Building Improvements [Member] \| United Kingdom [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of joint venture		$ 13,700
Loss on sale of join venture		6
Building and Building Improvements [Member] \| Philadelphia [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties \| bldg	1
Leaseable square feet \| ft²	48
Purchase price	$ 15,000
Land and Land Improvements [Member] \| Philadelphia [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Acres of developable land \| a	1
Investments in and advances to unconsolidated joint ventures [Member] \| Cambridge Medipark Ltd [Member] \| Equity Method Investee [Member] \| United Kingdom [Member] \| Other Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Notes payable	$ 2,500	$ 2,300

Number of equity method investments

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Area of land held.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Amount of gain (loss) on sale or disposal of an equity method investment.

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- Definition

Net rentable area for properties owned.

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The amount for notes payable (written promise to pay), due to related parties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

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

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ 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 (b)
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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.

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