Interest and Other Income (Loss), net - Schedule Of Interest And Other Income (Loss), net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest And Other Income [Abstract]
Preferred equity investment income	$ 3,655	$ 4,187	$ 5,716
Interest and other income	5,384	1,256	774
Mark-to-market of investments in our deferred compensation plans	(922)	5,114	444
Valuation allowance on preferred equity investment		(19,588)
Total interest and other income (loss), net	$ 8,117	$ (9,031)	$ 6,934