Other Income (Expense), Net - Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Income and Expenses [Abstract]
Interest and investment income	$ 1,342	$ 2,590	$ 4,219	$ 6,486
Gain on asset acquisition and sale of business	0	14,175	0	14,175
Loss on extinguishment of long-term debt	0	(5,488)	0	(5,488)
Other	2,447	1,077	5,593	796
Other income, net	$ 3,789	$ 12,354	$ 9,812	$ 15,969