Accounting Policies (Schedule of Foreign Currency Transaction Gains and Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Selling, general, and administrative expenses	$ 1,875	$ 1,281	$ (274)
Other expense, net	13,569	(4,471)	(67)
Total transaction losses/(gains)	$ 15,444	$ (3,190)	$ (341)