Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Document Fiscal Year Focus			2018
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 2,717	$ (39)	$ 16,511	$ (3,911)
Parent Company [Member]
Net income	(70,534)	(63,582)	(172,588)	(93,039)
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	2,717	(39)	16,511	(3,911)
Reclassification adjustment of derivative instruments included in net income	1,148	2,329	4,701	8,054
Available-for-sale Securities, Gross Unrealized Gain	24	8	(51)	51
Other comprehensive income	3,889	2,298	21,161	4,194
Comprehensive income	74,423	65,880	193,749	97,233
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(812)	(769)	(2,366)	(2,101)
Other comprehensive income (loss) attributable to noncontrolling interests	140	5	818	(11)
Comprehensive income attributable to noncontrolling interests	952	774	3,184	2,090
Comprehensive income attributable to the Company	73,471	65,106	190,565	95,143
Partnership Interest [Member]
Net income	(70,534)	(63,582)	(172,588)	(93,039)
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	2,717	(39)	16,511	(3,911)
Reclassification adjustment of derivative instruments included in net income	1,148	2,329	4,701	8,054
Available-for-sale Securities, Gross Unrealized Gain	24	8	(51)	51
Other comprehensive income	3,889	2,298	21,161	4,194
Comprehensive income	74,423	65,880	193,749	97,233
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(665)	(637)	(2,008)	(1,884)
Other comprehensive income (loss) attributable to noncontrolling interests	132	0	775	(17)
Comprehensive income attributable to noncontrolling interests	797	637	2,783	1,867
Comprehensive income attributable to the Company	$ 73,626	$ 65,243	$ 190,966	$ 95,366