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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Investments in unconsolidated joint ventures:
Total assets	$ 9,823,589		$ 9,823,589		$ 6,842,160
Mortgage notes payable that could become recourse debt to the Company	5,000		5,000		5,000
Indemnity of guaranteed amount	2,500		2,500		2,500
Amortization of difference between cost of investments and book value of underlying equity	4,988	$ 3,348	14,114	$ 3,188
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	267,200		267,200		460,872
Interest expense on borrowings from related party	2,775	$ 6,385	14,133	$ 22,976
Pacific Premier Retail LLC
Investments in unconsolidated joint ventures:
Total assets	3,211,370		3,211,370		3,283,702
Total liabilities	$ 1,908,533		$ 1,908,533		$ 1,938,241

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