Significant Acquisitions and Dispositions (Summary of Significant Assumptions Utilized in Estimates) (Details)	12 Months Ended
Dec. 31, 2015 $ / sqft months	Dec. 31, 2014 $ / sqft months
Fair Value Inputs, Discount Rate	7.07%
Fair Value Inputs, Cap Rate	5.57%
Lease-up period (months) \| months	12
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot		12.50
Industrial [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	4.85
Medical Office [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	0.00
Minimum [Member]
Fair Value Inputs, Discount Rate		7.38%
Fair Value Inputs, Cap Rate		5.98%
Lease-up period (months) \| months		12
Minimum [Member] \| Industrial [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot		2.75
Minimum [Member] \| Medical Office [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot		19.56
Maximum [Member]
Fair Value Inputs, Discount Rate		9.96%
Fair Value Inputs, Cap Rate		8.36%
Lease-up period (months) \| months		12
Maximum [Member] \| Industrial [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot		9.36
Maximum [Member] \| Medical Office [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot		19.56
Industrial [Member]
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	4.85

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- Definition

Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot

+ References

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- Definition

Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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