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Unconsolidated Joint Ventures	9 Months Ended
Unconsolidated Joint Ventures	Sep. 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 nine months ended September 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 $1.3 million and $5.8 million, respectively, for the three and nine months ended September 30, 2017 compared to $3.3 million and $3.5 million, respectively, for the same periods in 2016. Liberty Property 19th & Arch LP During the three months ended September 30, 2017, Liberty Property 19th & Arch LP (a joint venture in which the Company holds a 20% interest) acquired one redevelopment property containing 48,031 square feet of leaseable space for a purchase price of $15.0 million.