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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Changes in Non-cash Working Capital Items Related to Operating Activities
The changes in non-cash working capital items related to operating activities for the years ended December 31, 2017, 2016, and 2015 are as follows:
 
Year Ended December 31,
 
2017
$
 
2016
$
 
2015
$
Accounts receivable
14,353

 
(108
)
 
(5,765
)
Pool receivables from affiliates
16,193

 
38,137

 
(27,448
)
Due from affiliates
17,562

 
18,371

 
32,801

Prepaid expenses and other current assets
8,767

 
2,313

 
(6,267
)
Accounts payable and accrued liabilities
(13,996
)
 
(26,821
)
 
27,473

Due to affiliates
(32,641
)
 
(3,606
)
 
(12,735
)
Deferred revenue
(3,898
)
 
1,718

 
2,039

Other
(599
)
 
—

 
(8,443
)
Change in operating assets and liabilities
5,741


30,004


1,655