Area of land held.

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- Definition

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

+ References

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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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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- Definition

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)
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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

Net rentable area for properties owned.

+ References

No definition available.

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

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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Unconsolidated Joint Ventures (Details)	3 Months Ended		9 Months Ended
Unconsolidated Joint Ventures (Details)	Sep. 30, 2016 USD ($) ft² a bldg	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² a bldg	Sep. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Gain on extinguishment of debt	$ (3,494,000)	$ 0	$ (3,494,000)	$ 0
Gain on sale of properties			$ 25,671,000	56,987,000
Liberty Washington, LP [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%		25.00%
Liberty Washington, LP [Member] \| Discontinued Operations, Disposed of by Sale [Member] \| Joint venture, 2016 sales [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Net Rentable Area \| ft²	1,200,000		1,200,000
Number of Real Estate Properties \| bldg	12		12
Proceeds from Sale of Property			$ 187,200,000
Liberty Washington, LP [Member] \| Discontinued Operations, Disposed of by Sale [Member] \| Joint venture, 2016 sales [Member] \| Land and Land Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Area of Land \| a	6.0		6.0
Liberty Washington, LP [Member] \| Discontinued Operations, Disposed of by Sale [Member] \| Joint venture, 2016 sales current quarter [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Net Rentable Area \| ft²	593,000		593,000
Number of Real Estate Properties \| bldg	9		9
Proceeds from Sale of Property	$ 106,700,000
Liberty Washington, LP [Member] \| Discontinued Operations, Disposed of by Sale [Member] \| Joint venture, 2016 sales current quarter [Member] \| Land and Land Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Area of Land \| a	6.0		6.0
Liberty Washington, LP [Member] \| Discontinued Operations, Disposed of by Means Other than Sale [Member] \| Joint venture, 2016 transfer to lender [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Net Rentable Area \| ft²	698,000		698,000
Number of Real Estate Properties \| bldg	6		6
Liberty Washington, LP [Member] \| Discontinued Operations, Disposed of by Means Other than Sale [Member] \| Mortgages [Member] \| Joint venture, 2016 transfer to lender [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Debt amount extinguished			$ 112,500,000
Liberty Illinois, LP [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	25.00%		25.00%
Liberty Illinois, LP [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Net Rentable Area \| ft²	636,000		636,000
Number of Real Estate Properties \| bldg	4		4
Proceeds from Sale of Property			$ 32,500,000
Liberty Illinois, LP [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales current quarter [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Net Rentable Area \| ft²	636,000		636,000
Number of Real Estate Properties \| bldg	4		4
Proceeds from Sale of Property	$ 32,500,000
Cambridge Medipark Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Gain on equity method investments [Member] \| Cambridge Medipark Ltd [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests			$ 3,500,000
Gain on equity method investments [Member] \| Cambridge Medipark Ltd [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales current quarter [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests	$ 3,300,000
Gain on equity method investments [Member] \| Cambridge Medipark Ltd [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture sales, 2015 [Member] \| Leaseholds and Leasehold Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of leasehold interests		$ 89,000		$ 4,800,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Washington, LP [Member] \| Discontinued Operations [Member] \| Joint venture, 2016 sales [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of properties			6,000,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Washington, LP [Member] \| Discontinued Operations [Member] \| Joint venture, 2016 sales current quarter [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of properties	4,000,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Washington, LP [Member] \| Discontinued Operations [Member] \| Mortgages [Member] \| Joint venture, 2016 transfer to lender [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on extinguishment of debt	0		4,200,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Illinois, LP [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of properties			$ 1,000,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Illinois, LP [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales current quarter [Member] \| Building and Building Improvements [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of properties	$ 1,000,000