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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 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, net of the effects of acquisitions (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Decrease (increase) in restricted cash
$
33

 
$
(1
)
 
$
(1
)
Decrease (increase) in accounts receivable
78,624

 
(237,394
)
 
(90,810
)
Decrease (increase) in receivable from affiliates
685

 
23,764

 
(19,541
)
Decrease (increase) in inventories
52,166

 
(17,862
)
 
(30,686
)
Decrease (increase) in other current assets
(3,406
)
 
2,947

 
634

Decrease (increase) in other assets
(1,636
)
 
(14,307
)
 
(297
)
Increase (decrease) in accounts payable and accrued liabilities
(78,829
)
 
209,982

 
94,687

Increase (decrease) in payable to affiliates
(3,198
)
 
(19,537
)
 
21,475

Increase (decrease) in other noncurrent liabilities
1,374

 
19,385

 
2,573

 
$
45,813

 
$
(33,023
)
 
$
(21,966
)