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Unconsolidated Joint Ventures	6 Months Ended
Unconsolidated Joint Ventures	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	Unconsolidated Joint Ventures Cambridge Medipark Ltd During the three and six months ended June 30, 2017 and 2016, Cambridge Medipark, Ltd (a joint venture in which the Company holds a 50% interest) recognized gains on the sale of land leasehold interests. The Company's share of these gains was $1.5 million and $4.5 million, respectively, for the three and six months ended June 30, 2017 compared to $312,000 and $206,000, respectively, for the same periods in 2016.