9. Other Income and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest and investment income	$ (4,100)	$ (2,600)	$ (27,400)	$ (20,900)
Net realized (gain) loss on investments	(200)	100	(200)	300
Other than Temporary Impairment Losses on Investment	0	0	1,600	0
Gain on sale of land	0	0	0	(4,100)
Gain on divestiture of a product line	0	0	0	(5,100)
Other Nonoperating Income	(100)	(100)	(1,000)
Other Nonoperating Expense				(200)
Nonoperating (Income( Expense	$ (4,367)	$ (2,585)	$ (26,959)	$ (29,588)