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Note 29 - Segmented Information - Revenues and Long-lived Assets by Geographic Location (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues $ 2,786,857 $ 3,045,811
Operating lease right-of-use assets (note 9) 288,134 263,639
UNITED STATES    
Revenues 1,432,288 1,429,650
Total long-lived assets 1,378,648 1,057,543
Operating lease right-of-use assets (note 9) 82,520 88,589
CANADA    
Revenues 304,039 356,634
Total long-lived assets 306,472 293,673
Operating lease right-of-use assets (note 9) 84,758 84,969
Euro Currency Countries [Member]    
Revenues 280,853 356,171
Total long-lived assets 79,738 85,998
Operating lease right-of-use assets (note 9) 184,533 186,739
AUSTRALIA    
Revenues 190,106 235,469
UNITED KINGDOM    
Revenues 135,572 170,302
Other Geographic Locations [Member]    
Revenues $ 443,999 $ 497,585