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Consolidated Statements of Loss - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]    
Revenue $ 1,321,224 $ 1,003,233
Expenses:    
Operating 926,171 661,715
General and administrative 90,072 107,689
Restructuring   5,754
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization 304,981 228,075
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)
Operating loss (88,078) (155,979)
Foreign exchange (2,970) 6,008
Finance charges 137,928 146,360
Loss on redemption and repurchase of unsecured senior notes 9,021 239
Loss before tax (232,057) (308,586)
Income taxes:    
Current (1,331) (31,195)
Deferred (98,690) (121,836)
Income tax recovery (100,021) (153,031)
Net loss $ (132,036) $ (155,555)
Loss per share:    
Basic $ (0.45) $ (0.53)
Diluted $ (0.45) $ (0.53)