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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 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):
 
Three Months Ended March 31,
 
2018
 
2017
Decrease (increase) in restricted cash
$
33

 
$
28

Decrease (increase) in accounts receivable
122,829

 
(55,150
)
Decrease (increase) in receivable from affiliates
754

 
12,529

Decrease (increase) in inventories
25,220

 
(2,441
)
Decrease (increase) in other current assets
(3,748
)
 
857

Decrease (increase) in other assets
805

 
(875
)
Increase (decrease) in accounts payable and accrued liabilities
(104,888
)
 
40,485

Increase (decrease) in payable to affiliates
(4,650
)
 
(9,422
)
Increase (decrease) in other noncurrent liabilities
16,142

 
1,041

 
$
52,497

 
$
(12,948
)