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Investments in Unconsolidated Joint Ventures - Combined Condensed Balance Sheets of Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets:
Properties, net	$ 3,260,720	$ 2,967,878
Other assets	268,769	208,726
Total assets	3,529,489	3,176,604
Liabilities and partners' capital:
Mortgage notes payable	1,827,606	2,038,379
Other liabilities	197,905	195,766
Company's capital	769,715	489,349
Outside partners' capital	734,263	453,110
Total liabilities and partners' capital	3,529,489	3,176,604
Investments in unconsolidated joint ventures:
Company's capital	769,715	489,349
Basis adjustment	466,784	464,826
Investments in unconsolidated joint ventures	1,236,499	954,175
Assets—Investments in unconsolidated joint ventures	1,263,356	984,132
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	$ (26,857)	$ (29,957)

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