Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 514,222	$ 397,089	$ 209,536
Other comprehensive income (loss):
Change in fair value of interest rate swaps	17,308	24,598	(4,929)
Total comprehensive income	531,530	421,687	204,607
Less: comprehensive income attributable to noncontrolling interests	35,997	32,438	20,001
Comprehensive income attributable to common stockholders	$ 495,533	$ 389,249	$ 184,606