Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income	$ 52,690	$ 48,589	$ 144,183	$ 102,054
Other comprehensive (loss) income:
Effective portion of change in fair value of derivative instruments	(9,227)	4,289	(14,716)	13,794
Reclassification adjustment of derivative instruments included in net income	584	1,415	408	3,553
Unrealized gain (loss) on available-for-sale debt securities	123	44	260	(75)
Other comprehensive (loss) income	(8,520)	5,748	(14,048)	17,272
Comprehensive income	44,170	54,337	130,135	119,326
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	962	748	2,009	1,554
Other comprehensive (loss) income attributable to noncontrolling interests	(529)	195	(889)	678
Comprehensive income attributable to noncontrolling interests	433	943	1,120	2,232
Comprehensive income attributable to the Company	43,737	53,394	129,015	117,094
Partnership Interest [Member]
Net income	52,690	48,589	144,183	102,054
Other comprehensive (loss) income:
Effective portion of change in fair value of derivative instruments	(9,227)	4,289	(14,716)	13,794
Reclassification adjustment of derivative instruments included in net income	584	1,415	408	3,553
Unrealized gain (loss) on available-for-sale debt securities	123	44	260	(75)
Other comprehensive (loss) income	(8,520)	5,748	(14,048)	17,272
Comprehensive income	44,170	54,337	130,135	119,326
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	853	648	1,710	1,342
Other comprehensive (loss) income attributable to noncontrolling interests	(512)	183	(861)	643
Comprehensive income attributable to noncontrolling interests	341	831	849	1,985
Comprehensive income attributable to the Company	$ 43,829	$ 53,506	$ 129,286	$ 117,341