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Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2018
Cash Flow Statement [Abstract]  
Changes in non-cash working capital
Changes in non-cash working capital for the years ended December 31, 2018 and 2017 are as follows:
For the years ended December 31
2018

2017

Changes in non-cash working capital:
 
 
Trade and other receivables
$
22,068

$
(37,033
)
Inventories
(83,495
)
(23,136
)
Prepaid expenses
(5,993
)
(5,702
)
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities
(9,403
)
103,601

 
(76,823
)
37,730

Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid
81,877

(89,445
)
Changes in non-cash working capital
$
5,054

$
(51,715
)
These changes relate to the following activities:
 
 
Operating
$
5,998

$
(49,368
)
Financing
—

—

Investing
(944
)
(2,347
)
Changes in non-cash working capital
$
5,054

$
(51,715
)
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, 2017
$
1,502,271

$
204,242

 
 
 
Changes from financing cash flows
 
 
Repayment of long-term debt and financing fees
(213,622
)
—

Proceeds from limited recourse debt
166,000

—

Payment of finance lease liabilities
—

(8,293
)
Total changes from financing cash flows
$
(47,622
)
$
(8,293
)
 
 
 
Liability-related other changes
 
 
Finance costs
$
3,637

$
—

New finance leases
—

2,425

Total liability-related other changes
$
3,637

$
2,425

 
 
 
Balance at December 31, 2018
$
1,458,286

$
198,374