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Note 18 - Segmented Information - Revenues and Long-lived Assets by Geographic Location (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Revenues $ 1,482,889 $ 1,264,077
Total long-lived assets 460,364 357,699
UNITED STATES    
Revenues 1,393,950 1,181,435
Total long-lived assets 420,087 321,279
CANADA    
Revenues 88,939 82,642
Total long-lived assets $ 40,277 $ 36,420