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Segmented information - Business segments (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Segments [Line Items]    
Revenue $ 2,091,661 $ 2,156,852
Cost of products and services sold 1,467,940 1,390,233
Depreciation and amortization 327,973 330,345
Cost of sales 1,795,913 1,720,578
Gross profit 295,748 436,274
Administration 141,552 163,095
Impairment charges 0 358,330
Exploration 20,283 29,933
Research and development 1,757 5,660
Other operating expense 59,616 43
Loss on disposal of assets 2,303 6,947
Finance costs 111,779 110,608
Gain on derivatives 81,081 (56,250)
Finance income (22,071) (5,265)
Share of earnings from equity-accounted investee (32,321) 0
Other income (108,160) 30,410
Earnings (loss) before income taxes 39,929 (207,237)
Income tax recovery (126,306) (2,519)
Net earnings (loss) 166,235 (204,718)
Capital expenditures for the year 55,362 143,333
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 1,684,056 1,574,068
Cost of products and services sold 1,138,940 910,685
Depreciation and amortization 277,171 267,931
Cost of sales 1,416,111 1,178,616
Gross profit 267,945 395,452
Administration 0 0
Impairment charges 0 246,931
Exploration 20,283 29,933
Research and development 0 0
Other operating expense 59,616 43
Loss on disposal of assets 1,008 5,901
Finance costs 0 0
Gain on derivatives 0 0
Finance income 0 0
Share of earnings from equity-accounted investee (32,321) 0
Other income (81,955) 7,193
Earnings (loss) before income taxes 301,314 105,451
Capital expenditures for the year 44,114 132,073
Fuel Service [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 313,989 312,888
Cost of products and services sold 219,240 212,035
Depreciation and amortization 35,977 37,093
Cost of sales 255,217 249,128
Gross profit 58,772 63,760
Administration 0 0
Impairment charges 0 0
Exploration 0 0
Research and development 0 0
Other operating expense 0 0
Loss on disposal of assets 1,264 247
Finance costs 0 0
Gain on derivatives 0 0
Finance income 0 0
Share of earnings from equity-accounted investee 0 0
Other income 0 0
Earnings (loss) before income taxes 57,508 63,513
Capital expenditures for the year 11,226 11,237
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 93,616 269,896
Cost of products and services sold 109,760 267,513
Depreciation and amortization 14,825 25,321
Cost of sales 124,585 292,834
Gross profit (30,969) (22,938)
Administration 141,552 163,095
Impairment charges 0 111,399
Exploration 0 0
Research and development 1,757 5,660
Other operating expense 0 0
Loss on disposal of assets 31 799
Finance costs 111,779 110,608
Gain on derivatives 81,081 (56,250)
Finance income (22,071) (5,265)
Share of earnings from equity-accounted investee 0 0
Other income (26,205) 23,217
Earnings (loss) before income taxes (318,893) (376,201)
Capital expenditures for the year $ 22 $ 23