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Note 15 - Income Tax - Provision for (Recovery of) Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Current | $ 43,576 | $ 37,831
Deferred | 19,724 | 9,998
Total | 63,300 | 47,829
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Current, Canada | 4,031 | 5,091
Deferred, Canda | 3,125 | 2,278
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Current, United States and Other Foreign | 3,235 | 2,090
Deferred, United States and Other Foreign | 21,812 | 12,753
Foreign Tax Authority [Member] | Other Foreign Tax Authorities [Member] |  |
Current, United States and Other Foreign | 36,310 | 30,650
Deferred, United States and Other Foreign | $ (5,213) | $ (5,033)

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