Income Taxes - Components of Expense and Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ (1,359)	$ (239)	$ 6,583
State	1,171	352	(1,844)
Foreign	33,173	26,213	12,114
Current Income Tax Expense (Benefit), Total	32,985	26,326	16,853
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	(28,437)	(9,267)	7,859
State	(3,087)	(396)	(173)
Foreign	(6,757)	(14,579)	511
Income Tax Expense (Benefit), Total	(5,296)	2,084	25,050
Components Of Earnings Before Taxes [Abstract]
U.S.	(66,585)	(46,697)	27,387
Foreign	93,724	75,601	55,711
Income before taxes and equity in net income of associated companies	$ 27,139	$ 28,904	$ 83,098