Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 447,080	$ 514,222	$ 397,089
Other comprehensive income:
Change in fair value of interest rate swaps	1,430	17,308	24,598
Total comprehensive income	448,510	531,530	421,687
Less: comprehensive income attributable to noncontrolling interests	31,861	35,997	32,438
Comprehensive income attributable to common stockholders	$ 416,649	$ 495,533	$ 389,249