Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 60,075	$ 32,844	$ 80,509
Other comprehensive income (loss):
Change in fair value of marketable securities (see Note 5)	0	0	(2,762)
Change in value of interest rate cap	78	(1)	(70)
Comprehensive income	$ 60,153	$ 32,843	$ 77,677