Unconsolidated Joint Ventures Cambridge Medipark Ltd (Details) - Cambridge Medipark Ltd [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	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	$ 2.0
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		$ 3.0

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=98514028&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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