Interest and Other (Loss) Income, net - Schedule Of Interest And Other (Loss) Income, net (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest And Other Income [Abstract]
Valuation allowance on preferred equity investment	$ (19,588,000)		$ (19,588,000)
Preferred equity investment income	961,000	$ 1,460,000	3,327,000	$ 4,299,000
Interest and other income	147,000	103,000	743,000	533,000
Mark-to-market of investments in our deferred compensation plans	812,000	736,000	3,536,000	197,000
Total interest and other (loss) income, net	$ (17,668,000)	$ 2,299,000	$ (11,982,000)	$ 5,029,000