Income Taxes, Consolidated Income Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Income Before Provision for Income Taxes [Abstract]
U.S.	$ 71,138	$ 24,211	$ (67,087)
Foreign	185,094	230,961	286,753
Income before provision for income taxes	$ 256,232	$ 255,172	$ 219,666