Other Income (Expense), Net - Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income and Expenses [Abstract]
Interest and investment income	$ 825	$ 3,687	$ 5,044	$ 10,173
Gain on asset acquisition and sale of business	0	8,515	0	22,690
Loss on extinguishment of long-term debt	0	0	0	(5,488)
Other	3,169	(4,399)	8,762	(3,603)
Other income, net	$ 3,994	$ 7,803	$ 13,806	$ 23,772