Trade and Other Receivables (Schedule of Trade and Other Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Activity in the allowance for expected credit losses
Trade and other receivables, net	$ 135,001	$ 142,627
Opening balance at January 1, 2020	(5,225)
Current period provision	(3,986)
Write-off charged against the allowance	3,744
Balance, December 31, 2020	(5,467)
Trade Receivables [Member]
Activity in the allowance for expected credit losses
Trade and other receivables, net	111,545	126,977
Consumption Taxes Receivable [Member]
Activity in the allowance for expected credit losses
Trade and other receivables, net	20,789	12,108
Other Receivables [Member]
Activity in the allowance for expected credit losses
Trade and other receivables, net	$ 2,667	$ 3,542

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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