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Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Flow Statement [Abstract]  
Changes in non-cash working capital
Changes in non-cash working capital for the years ended December 31, 2017 and 2016 are as follows:
For the years ended December 31
2017

2016

Changes in non-cash working capital:
 
 
Trade and other receivables
$
(37,033
)
$
4,747

Inventories
(23,136
)
(28,094
)
Prepaid expenses
(5,702
)
(1,286
)
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities
103,601

14,577

 
37,730

(10,056
)
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid
(89,445
)
(65,850
)
Changes in non-cash working capital
$
(51,715
)
$
(75,906
)
These changes relate to the following activities:
 
 
Operating
$
(49,368
)
$
(87,644
)
Financing
—

—

Investing
(2,347
)
11,738

Changes in non-cash working capital
$
(51,715
)
$
(75,906
)
Reconciliation of liabilities arising from financing activities
Reconciliation of movements in liabilities to cash flows arising from financing activities:
 
Long term debt
(note 8)

Finance lease obligations (note 9)

Balance at December 31, 2016
$
1,556,206

$
201,268

 
 
 
Changes from financing cash flows
 
 
Repayment of long-term debt and financing fees
(56,997
)
—

Payment of finance lease liabilities
—

(6,880
)
Total changes from financing cash flows
$
(56,997
)
$
(6,880
)
 
 
 
Liability-related other changes
 
 
Finance costs
$
3,062

$
—

New finance leases
—

9,512

Other
—

342

Total liability-related other changes
$
3,062

$
9,854

 
 
 
Balance at December 31, 2017
$
1,502,271

$
204,242