Investments in Unconsolidated Joint Ventures (Other Joint Ventures) (Details) - Other Joint Ventures [Member] $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) a investment properties	Dec. 31, 2015 USD ($)
Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Building and Building Improvements [Member] \| Orlando [Member]
Schedule of Equity Method Investments [Line Items]
Number of equity method investments \| investment	3
Number of properties \| properties	6
Building and Building Improvements [Member] \| United Kingdom [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Sale of joint venture	$ 13,700
Loss on sale of join venture	$ 6
Land and Land Improvements [Member] \| Philadelphia [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
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]
Schedule of Equity Method Investments [Line Items]
Notes payable	$ 2,300	$ 2,700

Number of equity method investments

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- Definition

Area of land held.

+ References

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- Definition

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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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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
-Subparagraph (SX 210.4-08.(k)(1))
-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
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-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.

+ References

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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
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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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.

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