Investment in Office Properties - Schedule of Purchase Price Allocation for 2015 Purchases (Details) - 2015 Acquisitions $ in Thousands	Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items]
Land	$ 41,524
Buildings	224,716
Tenant improvements	11,982
Lease commissions	8,210
Below market leases	(14,426)
Mortgage debt assumed	(4,140)
Lease in place value
Real Estate Properties [Line Items]
Leases	16,108
Above market leases
Real Estate Properties [Line Items]
Leases	$ 2,026

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Below Market Leases

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Lease Commissions

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tenant Improvements

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464

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Amount of real estate acquired, at the acquisition date.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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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.

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