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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Schedule of 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:
 
 
Year Ended December 31,
 
2018
 
2017
 
2016
(Increase) decrease in:
 
 
 
 
 
Accounts receivable
$
130,573

 
$
(140,948
)
 
$
(9,859
)
Inventories
20,963

 
49,055

 
(54,361
)
Deferred charges
(5,826
)
 
(3,622
)
 
(3,902
)
Other current assets
9,337

 
(410
)
 
3,059

Increase (decrease) in:
 
 
 
 
 
Accounts payable
(130,991
)
 
97,569

 
(17,426
)
Accrued liabilities
(26,208
)
 
8,512

 
(8,161
)
Net changes in components of operating assets and liabilities
$
(2,152
)
 
$
10,156

 
$
(90,650
)