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Consolidated Statements of Cash Flow - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operations:    
Net loss $ (132,036) $ (155,555)
Adjustments for:    
Long-term compensation plans 6,795 28,313
Depreciation and amortization 377,746 391,659
Impairment of property, plant and equipment 15,313  
Gain on re-measurement of property, plant and equipment   (7,605)
Foreign exchange (2,873) 6,791
Finance charges 137,928 146,360
Loss on redemption and repurchase of unsecured senior notes 9,021 239
Income taxes (100,021) (153,031)
Other (2,025) (1,889)
Income taxes paid (3,645) (14,605)
Income taxes recovered 11,932 795
Interest paid (136,065) (139,575)
Interest received 1,865 3,478
Funds provided by operations 183,935 105,375
Changes in non-cash working capital balances (67,380) 17,133
Cash flows from used in operating activities 116,555 122,508
Investments:    
Purchase of property, plant and equipment (74,823) (203,472)
Purchase of intangibles (23,179)  
Proceeds on sale of property, plant and equipment 14,841 7,840
Business acquisition, net of cash acquired   (12,200)
Income taxes recovered   2,917
Changes in non-cash working capital balances (7,989) (9,010)
Cash flows from used in investing activities (91,150) (213,925)
Financing:    
Redemption and repurchase of unsecured senior notes (571,975) (677,704)
Debt issue costs (9,196) (10,752)
Debt amendment fees (1,793) (1,214)
Proceeds from issuance of long-term debt 509,180 469,420
Issuance of common shares on the exercise of options   1,926
Cash flows from used in financing activities (73,784) (218,324)
Effect of exchange rate changes on cash and cash equivalents (2,245) (19,313)
Decrease in cash and cash equivalents (50,624) (329,054)
Cash and cash equivalents, beginning of year 115,705 444,759
Cash and cash equivalents, end of year $ 65,081 $ 115,705