Accounts Receivable (Schedule of Accounts Receivable, Current) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Noncurrent receivables invoice terms (in years)	10 years
Trade and other accounts receivable	$ 167,370	$ 201,427
Bank promissory notes	24,860	18,563
Allowance for expected credit losses	(3,807)	(1,719)
Accounts receivable, net	$ 188,423	$ 218,271