Other (Expense) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ (1,429)	$ (3,022)	$ (3,170)
Components of Net Periodic Benefit Cost Other than Service Cost	(576)	(1,069)	(1,116)
Gain (Loss) on Sale of Accounts Receivable	(776)	(1,007)	(1,248)
Miscellaneous Income Expense	201	838	696
Other Nonoperating Income (Expense)	$ (2,580)	$ (4,260)	$ (4,838)