Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental cash flow information:
Interest paid, net of capitalized interest	$ 92,701	$ 108,232
Income taxes paid	340	1,105
Capitalized interest	3,578	3,090
Supplemental schedule of non-cash investing and financing activities:
Accrued construction costs	62,160	51,498
Derecognition of U.K. Bridge Loan receivable	147,474	0
Consolidation of net assets related to U.K. Bridge Loan	106,457	0
Deconsolidation of noncontrolling interest in connection with RIDEA II transaction	0	58,061
Vesting of restricted stock units and conversion of non-managing member units into common stock	$ 258	$ 1,841