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Supplemental Cash Flow Information (Net Changes in Components of Operating Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
(Increase) decrease in:
Accounts receivable	$ (80,126)	$ 130,573	$ (140,948)
Inventories	7,659	20,963	49,055
Deferred charges	4,093	(5,826)	(3,622)
Other current assets	(4,874)	9,337	(410)
Increase (decrease) in:
Accounts payable	81,915	(130,991)	97,569
Accrued liabilities	(79,765)	(26,208)	8,512
Net changes in components of operating assets and liabilities	$ (71,098)	$ (2,152)	$ 10,156

X

- Definition

The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

+ References

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-Section 45
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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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Amount of increase (decrease) in current assets classified as other.

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