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Consolidated statements of cash flows - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating activities    
Profit (loss) $ (53,197) $ 73,941
Adjustments for:    
Depreciation and amortization 208,662 275,749
Deferred charges (2,945) (13,013)
Unrealized loss (gain) on derivatives (42,892) (55,048)
Share-based compensation 6,564 14,342
Loss on disposal of assets 1,072 1,869
Finance costs 96,133 98,622
Finance income (10,835) (29,760)
Share of earnings from equity-accounted investee (36,476) (45,360)
Other expense (income) (13,891) 18,961
Other operating expense 23,921 2,732
Income tax expense (recovery) 13,666 61,077
Interest received 9,994 30,944
Income taxes paid (4,374) (18,589)
Dividends from equity-accounted investee 54,404 14,079
Other operating items (192,917) 96,478
Net cash provided by operations 56,889 527,024
Investing activities    
Additions to property, plant and equipment (77,462) (75,211)
Decrease (increase) in short-term investments (24,985) 391,025
Decrease in long-term receivables, investments and other 907 120,913
Proceeds from sale of property, plant and equipment 511 679
Net cash provided by (used in) investing (101,029) 437,406
Financing activities    
Increase in long-term debt 397,539 0
Decrease in long-term debt (400,000) (500,000)
Interest paid (65,547) (72,484)
Proceeds from issuance of shares, stock option plan 5,375 81
Lease principal payments (3,716) (2,904)
Dividends paid (31,638) (31,613)
Net cash used in financing (97,987) (606,920)
Increase (decrease) in cash and cash equivalents, during the year (142,127) 357,510
Exchange rate changes on foreign currency cash balances (1,922) (6,607)
Cash and cash equivalents, beginning of year 1,062,431 711,528
Cash and cash equivalents, end of year 918,382 1,062,431
Cash and cash equivalents is comprised of:    
Cash 503,496 427,986
Cash equivalents $ 414,886 $ 634,445