Other Non-Operating Income (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Nonoperating Income (Expense) [Abstract]
Gain on a cost method investment	$ 2,723	$ 0
Gain on sale of businesses	802	107
Gain on sale of cost method investments	94	518
Foreign currency gain, net	3	4,290
Impairment of cost method investments	0	(2,577)
Loss on sale of an equity affiliate	0	(103)
Other gain, net	2,698	453
Total Other Non-Operating Income	$ 6,320	$ 2,688