Income Taxes - Components of Expense and Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ (239)	$ 6,583	$ 21,265
State	352	(1,844)	2,529
Foreign	26,213	12,114	14,105
Current Income Tax Expense (Benefit), Total	26,326	16,853	37,899
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	(9,267)	7,859	6,889
State	(396)	(173)	(36)
Foreign	(14,579)	511	(3,099)
Income Tax Expense (Benefit), Total	2,084	25,050	41,653
Components Of Earnings Before Taxes [Abstract]
Domestic	(46,697)	27,387	10,468
Foreign	75,601	55,711	50,200
Income before taxes and equity in net income of associated companies	$ 28,904	$ 83,098	$ 60,668