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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-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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No definition available.

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Unconsolidated Joint Ventures Cambridge Medipark Ltd (Details) - Cambridge Medipark Ltd [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	50.00%		50.00%
Joint venture, 2018 sales current quarter [Member] \| Leaseholds and Leasehold Improvements [Member] \| Other Income [Member] \| Disposal Group, Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests	$ 1.2
Joint venture, 2018 sales [Member] \| Leaseholds and Leasehold Improvements [Member] \| Other Income [Member] \| Disposal Group, Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests			$ 5.0
Joint venture, 2017 sales current quarter [Member] \| Leaseholds and Leasehold Improvements [Member] \| Other Income [Member] \| Disposal Group, Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests		$ 1.3
Joint venture, 2017 sales [Member] \| Leaseholds and Leasehold Improvements [Member] \| Other Income [Member] \| Disposal Group, Not Discontinued Operations [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests				$ 5.8