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

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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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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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.

+ References

No definition available.

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Unconsolidated Joint Ventures (Details) - Cambridge Medipark Ltd [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Joint venture, 2017 sales current quarter [Member] \| Gain on equity method investments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of leasehold interests	$ 1,500,000
Joint venture, 2017 sales [Member] \| Gain on equity method investments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of leasehold interests			$ 4,500,000
Joint venture, 2016 sales current quarter [Member] \| Gain on equity method investments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of leasehold interests		$ 312,000
Joint venture, 2016 sales [Member] \| Gain on equity method investments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sale of leasehold interests				$ 206,000