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Statement of Cash Flows - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating activities    
Net loss $ (204,718) $ (59,879)
Adjustments for:    
Depreciation and amortization 330,345 371,689
Deferred charges (1,101) (95,873)
Unrealized gain on derivatives (62,569) (110,358)
Share-based compensation 13,960 14,101
Loss on disposal of assets 6,947 23,168
Finance costs 110,608 111,906
Finance income (5,265) (4,379)
Impairment charges 358,330 361,989
Other expense (income) 30,522 (1,630)
Other operating expense (income) 43 (34,075)
Income tax recovery (2,519) (94,355)
Interest received 11,592 1,838
Income taxes paid (77,182) (102,628)
Other operating items 87,057 (69,134)
Net cash provided by operations 596,050 312,380
Investing activities    
Additions to property, plant and equipment (114,028) (216,908)
Decrease (increase) in long-term receivables, investments and other 19,023 (3,080)
Proceeds from sale of property, plant and equipment 1,951 2,168
Net cash used in investing (93,054) (217,820)
Financing activities    
Interest paid (69,498) (70,446)
Proceeds from issuance of shares, stock option plan 4 0
Dividends paid (158,297) (158,310)
Net cash used in financing (227,791) (228,756)
Increase (decrease) in cash and cash equivalents, during the year 275,205 (134,196)
Exchange rate changes on foreign currency cash balances (3,863) (4,130)
Cash and cash equivalents, beginning of year 320,278 458,604
Cash and cash equivalents, end of year 591,620 320,278
Cash and cash equivalents is comprised of:    
Cash 190,174 79,730
Cash equivalents $ 401,446 $ 240,548