Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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	$ 4,289	$ (3,805)	$ 13,794	$ (3,873)
Parent Company [Member]
Net income	(48,589)	(50,173)	(102,054)	(29,457)
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	4,289	(3,805)	13,794	(3,873)
Reclassification adjustment of derivative instruments included in net income	1,415	3,071	3,553	5,726
Available-for-sale Securities, Gross Unrealized Gain	44	11	(75)	43
Other comprehensive income (loss)	5,748	(723)	17,272	1,896
Comprehensive income	54,337	49,450	119,326	31,353
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(748)	(680)	(1,554)	(1,332)
Other comprehensive income (loss) attributable to noncontrolling interests	195	(80)	678	(15)
Comprehensive income attributable to noncontrolling interests	943	600	2,232	1,317
Comprehensive income attributable to the Company	53,394	48,850	117,094	30,036
Partnership Interest [Member]
Net income	(48,589)	(50,173)	(102,054)	(29,457)
Other comprehensive income (loss):
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	4,289	(3,805)	13,794	(3,873)
Reclassification adjustment of derivative instruments included in net income	1,415	3,071	3,553	5,726
Available-for-sale Securities, Gross Unrealized Gain	44	11	(75)	43
Other comprehensive income (loss)	5,748	(723)	17,272	1,896
Comprehensive income	54,337	49,450	119,326	31,353
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(648)	(576)	(1,342)	(1,247)
Other comprehensive income (loss) attributable to noncontrolling interests	183	79	643	(16)
Comprehensive income attributable to noncontrolling interests	831	655	1,985	1,231
Comprehensive income attributable to the Company	$ 53,506	$ 48,795	$ 117,341	$ 30,122