Other Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Noncontrolling Interest, Decrease from Deconsolidation			$ 10,657,000
Realized gain (loss) from disposal of cost and equity method investments		$ 682,000		$ 682,000
Other income (expense)	$ (7,000)	26,000	271,000	(220,000)
Gain (Loss) on Disposition of Business	1,424,000	800,000	1,424,000	800,000
Cost-method Investments, Realized Gains	168,000		168,000
Foreign currency transaction gain	9,912,000	(5,916,000)	18,797,000	9,868,000
Other, net	$ 8,649,000	$ (6,008,000)	$ 17,812,000	$ 9,530,000