9. Other Income and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest and investment income	$ (2,800)	$ (19,500)
Net realized (gain) loss on investments	(400)	0
Other than Temporary Impairment Losses on Investment	0	1,600
Other Nonoperating Income	(100)	(800)
Other Nonoperating Income (Expense)	$ 3,273	$ 18,696