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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investments in unconsolidated joint ventures:
Total assets	$ 3,529,489		$ 3,529,489		$ 3,176,604
Mortgage notes payable that could become recourse debt to the Company	6,500		6,500		33,540
Indemnity of guaranteed amount	3,250		3,250		16,770
Amortization of difference between cost of investments and book value of underlying equity	260	$ 855	160	$ 2,279
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	465,837		465,837		606,263
Interest expense on borrowings from related party	8,083	$ 9,623	16,591	$ 19,347
Tysons Corner LLC
Investments in unconsolidated joint ventures:
Total assets	292,501		292,501		341,931
Total liabilities	$ 860,982		$ 860,982		$ 871,933

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