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Details of Certain Consolidated Balance Sheet Captions (Accounts Receivable, net) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Details of Certain Consolidated Balance Sheet Captions [Abstract]
Trade accounts receivables	$ 808,459	$ 830,919
Less: allowance for doubtful accounts	(59,280)	(47,269)
Other short-term receivables	20,179	18,031
Less: allowance for doubtful accounts	(15,896)	(6,143)
Accounts receivable, net	$ 753,462	$ 795,538

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Details of Certain Consolidated Balance Sheet Captions [Abstract]

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