Summary of Significant Accounting Policies (Schedule of Other, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Interest and dividend income	$ 1,489	$ 1,510	$ 4,265	$ 5,045
Gain on long-term investment	190	137	190	361
Provision for loss on real estate held for sale	0	(229)	0	(229)
Loss on sale of assets	0	(75)	0	(75)
Impairment of long-term investments	0	0	(1,203)	0
Other expense	(351)	(1)	(296)	(2)
Other, net	$ 1,328	$ 1,342	$ 2,956	$ 5,100