Condensed 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
Statement of Comprehensive Income [Abstract]
Net income	$ 139,687	$ 101,075	$ 337,830	$ 284,907
Other comprehensive income:
Change in fair value of interest rate swaps	5,716	759	36,812	992
Total comprehensive income	145,403	101,834	374,642	285,899
Less: comprehensive income attributable to noncontrolling interests	9,553	7,342	25,743	21,886
Comprehensive income attributable to common stockholders	$ 135,850	$ 94,492	$ 348,899	$ 264,013