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Real Estate Investments - Noncontrolling Interests in Subsidiaries and VIEs (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2011	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Nov. 30, 2011	Aug. 31, 2007 a
Real Estate Properties [Line Items]
Real estate impairment	$ 5,900		$ 5,909	$ 0	$ 0
Land			561,256	543,546
Real Estate Investment Property, Accumulated Depreciation			(692,608)	(640,434)
Properties under development or held for future development			36,094	76,235
Mortgage notes payable			418,052	417,194
Accounts payable and other liabilities			45,367	54,318
Tenant security deposits			$ 9,378	8,899
Maximum [Member]
Real Estate Properties [Line Items]
Ownership percentage			95.00%
4661 Kenmore Avenue [Member]
Real Estate Properties [Line Items]
Land, Acres Held | a							0.8
Six Fifty North Glebe Road [Member]
Real Estate Properties [Line Items]
Ownership percentage		90.00%
Variable Interest Entity, Consolidated, Carrying Amount, Assets			$ 0	17,947
Land			12,851	12,851
Investment Building and Building Improvements			37,791	18,432
Real Estate Investment Property, Accumulated Depreciation			(2,347)	0
Properties under development or held for future development			1,188	0
Real Estate Investments, Joint Ventures			49,483	49,230
Mortgage notes payable			32,214	27,690
Accounts payable and other liabilities			256	2,196
Tenant security deposits			$ 82	$ 17
Variable Interest Entity, Classification of Carrying Amount, Liabilities			32552	29903
1225 First Street [Member]
Real Estate Properties [Line Items]
Ownership percentage by noncontrolling owners						5.00%
Variable Interest Entity, Consolidated, Carrying Amount, Assets				$ 20,800
Multifamily [Member]
Real Estate Properties [Line Items]
Properties under development or held for future development			$ 16,307	$ 39,356
Multifamily [Member] | 1225 First Street [Member]
Real Estate Properties [Line Items]
Disposal Group, Not Discontinued Operation, Sale Price			$ 14,500

X

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(1),(5))
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- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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- Definition

Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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The book value of investments in real estate joint ventures including direct and indirect investments.

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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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No definition available.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

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Balance sheet classification of the Variable Interest Entity's (VIE) liabilities included in the statement of financial position of the reporting entity. This element is applicable for variable interests whether the reporting entity has a controlling financial interest (primary beneficiary) or not.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Disposal Group, Excluding Discontinued Operation, Sale Price

+ References

No definition available.

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Land, Acres Held

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No definition available.

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