9. Other Income and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest and investment income	$ (10,000)	$ (3,800)	$ (12,800)	$ (23,300)
Net realized (gain) loss on investments	(200)	0	(600)	0
Other Nonoperating (expense) Income	(100)	(100)	0	(900)
Other Nonoperating Income (Expense)	17,229	3,896	20,502	22,592
Gain on Disposition of a division	(11,700)	0	(11,700)	0
Equity Method Investment, Other than Temporary Impairment	$ 4,600	$ 0	$ 4,600	$ 1,600