Other Non-Operating Income (Details 1) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Nonoperating Income (Expense) [Abstract]
Net gain (loss) on sale of businesses											$ 213,302	$ (564)	$ 8,157
Impairment of cost method investments	$ (4,800)			$ (2,600)							(7,327)	0	(2,697)
Net gain on cost method investments		$ 1,600	$ 2,600			$ 3,700		$ 1,300	$ 3,200	$ 8,500	4,209	5,080	11,663
Gain on acquiring a controlling interest in an equity affiliate											3,708	0	0
Foreign currency loss, net											(2,153)	(1,070)	(3,844)
Gain on sale of equity affiliates											1,370	28,994	0
Gain on sale of cost method investments											1,039	267	2,845
Loss on guarantor obligations											(1,014)	(1,075)	(17,518)
Net (loss) gain on sale of property, plant and equipment											0	(82)	2,539
Other, net											1,400	881	958
Other income, net	$ 203,524	$ 222	$ 8,100	$ 2,688	$ (3,704)	$ 5,556	$ 1,228	$ 29,351			$ 214,534	$ 32,431	$ 2,103