Other Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income (Expense) [Abstract]
COVID-19 Impact on COGS	$ 4,563
COVID-19 Impact on SGA	1,451
Loss on early extinguishment of debt	8,073	$ 2,030	$ 26,583
Principal amount of repurchased debt	151,546	19,366	538,444
Schedule of Equity Method Investments [Line Items]
Foreign exchange gain (loss)	(4,095)	(1,414)	(1,991)
Interest income	3,709	8,445	11,940
Other components of net periodic pension cost	(13,613)	(13,959)	(13,118)
Investment income (expense)	2,271	6,448	(1,646)
Other	(26)	61	(266)
Other Income (expense)	$ (11,754)	$ (419)	$ (5,081)