Other Non-Operating Income (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Nonoperating Income (Expense) [Abstract]
Gain on sale of an equity affiliate									$ 28,994	$ 0	$ 0
Loss on guarantor obligations									(1,075)	(17,518)	0
Net gain on cost method investments		$ 3,700		$ 1,300	$ 3,200	$ 8,500			5,080	11,663	0
Net (loss) gain on sales of businesses									(564)	8,157	(569)
Foreign currency (loss) gain, net									(1,070)	(3,844)	3,310
Gain on sale of cost method investments									267	2,845	16
Impairment of cost method investments									0	(2,697)
Impairment of cost method investments											(200)
Net (loss) gain on sale of property, plant and equipment									(82)	2,539	0
Marketable Securities, Realized Gain (Loss)									9,500	37,300
Other, net									881	958	1,684
Other income, net	$ (3,704)	$ 5,556	$ 1,228	$ 29,351	$ (12,559)	$ 3,142	$ 2,333	$ 9,187	$ 32,431	$ 2,103	$ 4,241