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 Income And Comprehensive Income [Abstract]
Net income	$ 4,374	$ 3,960	$ 19,783	$ 39,555
Other comprehensive income/(loss):
Unrealized derivative gain/(loss) on interest rate caps	(73)	12	81	(81)
Total other comprehensive income/(loss):	(73)	12	81	(81)
Total comprehensive income	$ 4,301	$ 3,972	$ 19,864	$ 39,474