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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
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, net of the effects of acquisitions (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Decrease (increase) in restricted cash
$
(1
)
 
$
(1
)
 
$
6,764

Decrease (increase) in accounts receivable
(237,394
)
 
(90,810
)
 
9,051

Decrease (increase) in receivable from affiliates
23,764

 
(19,541
)
 
10,905

Decrease (increase) in inventories
(17,862
)
 
(30,686
)
 
(31,043
)
Decrease (increase) in other current assets
2,947

 
634

 
(508
)
Decrease (increase) in other assets
(14,307
)
 
(297
)
 
4,015

Increase (decrease) in accounts payable and accrued liabilities
209,982

 
94,687

 
2,513

Increase (decrease) in payable to affiliates
(19,537
)
 
21,475

 
(8,427
)
Increase (decrease) in payables to pre-petition creditors
—

 
—

 
(3,837
)
Increase (decrease) in other noncurrent liabilities
19,385

 
2,573

 
(2,625
)
 
$
(33,023
)
 
$
(21,966
)
 
$
(13,192
)