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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2018
Supplemental Cash Flow Information [Abstract]  
Schedule of Changes in Operating Assets and Liabilities The following table summarizes the changes in the components of operating assets and liabilities shown on our condensed consolidated statements of cash flows (in thousands):
 
Nine Months Ended September 30,
 
2018
 
2017
Decrease (increase) in restricted cash
$
33

 
$
28

Decrease (increase) in accounts receivable
(14,835
)
 
(36,203
)
Decrease (increase) in receivable from affiliates
793

 
19,924

Decrease (increase) in inventories
57,530

 
(28,297
)
Decrease (increase) in other current assets
(4,007
)
 
(3,409
)
Decrease (increase) in other assets
(3,131
)
 
(17,723
)
Increase (decrease) in accounts payable and accrued liabilities
(37,453
)
 
57,073

Increase (decrease) in payable to affiliates
(5,619
)
 
(21,631
)
Increase (decrease) in other noncurrent liabilities
(3,637
)
 
7,370

 
$
(10,326
)
 
$
(22,868
)