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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Investments in unconsolidated joint ventures:
Total assets	$ 9,868,613		$ 6,842,160
Mortgage notes payable that could become recourse debt to the Company	5,000		5,000
Indemnity of guaranteed amount	2,500		2,500
Amortization of difference between cost of investments and book value of underlying equity	4,457	$ 420
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	458,843		460,872
Interest expense on borrowings from related party	6,366	$ 8,508
Pacific Premier Retail LLC [Member]
Investments in unconsolidated joint ventures:
Total assets	3,258,293		3,283,702
Total liabilities	$ 1,919,760		$ 1,938,241

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