Other Non-Operating Income (Details 1) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Nonoperating Income (Expense) [Abstract]
Foreign currency gain (loss), net	$ 1,414	$ (3,797)		$ 6,608	$ (33,324)
(Loss) gain on sales of businesses	0	0		(342)	18,931
Loss on write-downs of cost method investments	(200)	(15,000)		(200)	(15,161)
Gain on sale of land	0	0	$ 34,100	0	34,072
Gain on sales of marketable equity securities (see Note 2)	0	0		0	6,256
Gain on the formation of a joint venture	0	0		0	3,232
Other, net	749	572		815	1,865
Total Other Non-Operating Income (Expense)	$ 1,963	$ (18,225)		$ 6,881	$ 15,871