Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 243,258	$ 252,325	$ 178,980
Other comprehensive income:
Effective portion of change in fair value of derivative instruments	(15,585)	402	1,151
Reclassification adjustment of derivative instruments included in net income	3,269	5,342	11,103
Unrealized gain (loss) on available-for-sale securities	315	(95)	(8)
Other comprehensive income	(12,001)	5,649	12,246
Comprehensive income	231,257	257,974	191,226
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	3,828	3,198	2,903
Other comprehensive income attributable to noncontrolling interests	(931)	299	189
Comprehensive income attributable to noncontrolling interests	2,897	3,497	3,092
Comprehensive income attributable to the Company	228,360	254,477	188,134
Partnership Interest [Member]
Net income	243,258	252,325	178,980
Other comprehensive income:
Effective portion of change in fair value of derivative instruments	(15,585)	402	1,151
Reclassification adjustment of derivative instruments included in net income	3,269	5,342	11,103
Unrealized gain (loss) on available-for-sale securities	315	(95)	(8)
Other comprehensive income	(12,001)	5,649	12,246
Comprehensive income	231,257	257,974	191,226
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	3,194	2,673	2,515
Other comprehensive income attributable to noncontrolling interests	(912)	288	168
Comprehensive income attributable to noncontrolling interests	2,282	2,961	2,683
Comprehensive income attributable to the Company	$ 228,975	$ 255,013	$ 188,543