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Mortgage Notes Payable (Details) (USD $)			9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Olney Village Center [Member] Mortgages [Member]	Sep. 30, 2011 John Marshall II [Member] Mortgages [Member]	Sep. 30, 2011 Shady Grove Medical Village II [Member]	Sep. 30, 2011 Columbia Park Road And Dulles Business Park [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage notes payable	$ 428,909,000	$ 361,860,000	$ 22,600,000	$ 54,100,000
Mortgage note interest rate, percentage	3.875%		6.37%	5.79%
Mortgage note, fair value interest rate			4.94%
Mortgage note maturity date			Nov. 01, 2023	May 06, 2016
Fair value of mortgage			24,400,000
Repayment of secured mortgage notes					9,100,000	17,900,000
Increase in sales price for partially offsetting the penalties incurred due to prepayment of mortgage notes						875,000
Prepayment penalties incurred on mortgage notes						$ 1,000,000

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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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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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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Increase In Sales Price For Partially Offsetting The Penalties Incurred Due To Prepayment Of Mortgage Note

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Prepayment penalties incurred on mortgage notes

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Repayment of secured mortgage notes

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