Other Non-Operating Income (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Nonoperating Income (Expense) [Abstract]
Gain on cost method investments	$ 0	$ 1,638	$ 10,506	$ 4,209
Gain on sale of cost method investments	0	521	6,793	1,039
Gain on sale of businesses	1,303	755	2,749	2,515
Foreign currency (loss) gain, net	(6)	(2,343)	674	877
Gain on acquiring a controlling interest in an equity affiliate	0	0	0	3,708
Impairment of cost method investments	0	0	0	(2,577)
Gain on sale of equity affiliates	0	0	0	1,370
Other gain (loss), net	3,921	(349)	6,938	(131)
Total Other Non-Operating Income	$ 5,218	$ 222	$ 27,660	$ 11,010