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Consolidated Statements of Cash Flow - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operations:    
Net loss $ (294,270) $ (132,036)
Adjustments for:    
Long-term compensation plans 17,401 6,795
Depreciation and amortization 365,660 377,746
Impairment of property, plant and equipment   15,313
Impairment of goodwill 207,544  
Foreign exchange 2,341 (2,873)
Finance charges 127,178 137,928
Loss (gain) on redemption and repurchase of unsecured senior notes (5,672) 9,021
Income taxes (29,326) (100,021)
Other (1,269) (2,025)
Income taxes paid (4,446) (3,645)
Income taxes recovered 33,283 11,932
Interest paid (108,622) (136,065)
Interest received 1,412 1,865
Funds provided by operations 311,214 183,935
Changes in non-cash working capital balances (17,880) (67,380)
Cash provided by operations 293,334 116,555
Investments:    
Purchase of property, plant and equipment (114,576) (74,823)
Purchase of intangibles (11,567) (23,179)
Proceeds on sale of property, plant and equipment 24,457 14,841
Changes in non-cash working capital balances 892 (7,989)
Cash used in investing activities (100,794) (91,150)
Financing:    
Redemption and repurchase of unsecured senior notes (168,722) (571,975)
Debt issuance costs   (9,196)
Debt amendment fees (638) (1,793)
Proceeds from issuance of long-term debt   509,180
Issuance of common shares on the exercise of options 275  
Cash used in financing activities (169,085) (73,784)
Effect of exchange rate changes on cash and cash equivalents 8,090 (2,245)
Increase (decrease) in cash and cash equivalents 31,545 (50,624)
Cash and cash equivalents, beginning of year 65,081 115,705
Cash and cash equivalents, end of year $ 96,626 $ 65,081