Income Taxes - Income (Loss) Before Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 68,555	$ (102,004)	$ 19,109
Non-U.S.	4,180	172	1,892
Income (loss) from continuing operations before income taxes	$ 72,735	$ (101,832)	$ 21,001