Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2021

Supplemental Cash Flow Elements [Abstract]

Net Changes In Components of Operating Assets and Liabilities

The following table provides information regarding the net changes in components of operating assets and liabilities.

	Six Months Ended June 30,
	2021		2020
(Increase) decrease in:
Accounts receivable	$	(77,785)	$	178,509
Inventories	21,550		(44,394)
Deferred charges	9,823		9,240
Other current assets	(4,835)		(9,919)
Increase (decrease) in:
Accounts payable	49,809		(93,080)
Accrued liabilities	32,710		(20,838)
Net changes in components of operating assets and liabilities	$	31,272	$	19,518