Real Estate Other (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 323,837	$ 498,640
Investment in real estate, net	20,276,946	22,242,578
Partially Owned Properties	4,608	124,909
Restricted Cash and Cash Equivalents	55,893	$ 72,303
Company's Portion [Member]
Land purchase price	76,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	102,500
Joint Venture Partner [Member]
Land purchase price	57,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	75,700
Investment in real estate, net	116,700
Partially Owned Properties	117,300
Accrued Liabilities	1,100
Restricted Cash and Cash Equivalents	$ 1,700