Interest and Other (Loss) Income, net - Schedule Of Interest And Other (Loss) Income, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest And Other Income [Abstract]
Valuation allowance on preferred equity investment	$ (19,588)
Preferred equity investment income	4,187	$ 5,716
Interest and other income	1,256	774	$ 674
Mark-to-market of investments in our deferred compensation plans	5,114	444	197
Total interest and other (loss) income, net	$ (9,031)	$ 6,934	$ 871