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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Investments in unconsolidated joint ventures:
Total assets	$ 9,838,939		$ 9,838,939		$ 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	(4,669)	$ (260)	(9,126)	$ (160)
Northwestern Mutual Life (NML)
Investments in unconsolidated joint ventures:
Mortgage notes payable to affiliate	269,350		269,350		460,872
Interest expense on borrowings from related party	4,992	$ 8,083	11,358	$ 16,591
Pacific Premier Retail LLC
Investments in unconsolidated joint ventures:
Total assets	3,225,172		3,225,172		3,283,702
Total liabilities	$ 1,909,943		$ 1,909,943		$ 1,938,241

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