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Real Estate - Secured Debt (Details) (USD $)					0 Months Ended
Real Estate - Secured Debt (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 650 N Glebe [Member]	Feb. 21, 2013 650 N Glebe [Member]	Feb. 21, 2013 650 N Glebe [Member] Secured Debt [Member] LIBOR [Member] Maximum [Member]	Feb. 21, 2013 650 N Glebe [Member] Secured Debt [Member] LIBOR [Member] Minimum [Member]
Debt Instrument [Line Items]
Construction loan agreement				$ 33,000,000
Basis spread on variable interest rate					2.15%	2.00%
Mortgage notes payable	$ 312,211,000	$ 342,970,000	$ 400,000

This element represents the current and noncurrent portions of a long-term real estate loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project (generally one to seven years), usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property.

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