Investments in Unconsolidated Joint Ventures - Combined Condensed Balance Sheets of unconsolidated joint ventures (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments in unconsolidated joint ventures:
Assets—Investments in unconsolidated joint ventures	$ 1,528,080	$ 1,492,655
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	(116,634)	(114,988)
Joint Venture
Assets:
Property, net	9,267,357	9,241,003
Other assets	777,348	703,861
Total assets	10,044,705	9,944,864
Liabilities and partners' capital:
Mortgage and other notes payable	6,053,545	6,050,930
Other liabilities	424,462	388,509
Company's capital	1,938,931	1,913,475
Outside partners' capital	1,627,767	1,591,950
Total liabilities and partners' capital	10,044,705	9,944,864
Investments in unconsolidated joint ventures:
Company's capital	1,938,931	1,913,475
Basis adjustment	(527,485)	(535,808)
Investments in unconsolidated joint ventures	1,411,446	1,377,667
Assets—Investments in unconsolidated joint ventures	1,528,080	1,492,655
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	(116,634)	(114,988)
Investments in unconsolidated joint ventures	$ 1,411,446	$ 1,377,667