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Income Taxes (Provision (Benefit) For Income Taxes) (Details) $ in Thousands, CAD in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 CAD | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Taxes [Abstract] |  |  |  |  |
U.S. Federal - Current |  |  | $ 1,283 | $ 85 | $ 84
U.S. Federal - Deferred |  |  | (786) | 0 | 0
Provision for U.S. federal income taxes |  |  | 497 | 85 | 84
Foreign - Current |  |  | 3,094 | 1,898 | 2,875
Foreign - Deferred |  |  | 969 | (196) | (1,305)
Provision for foreign income taxes |  |  | 4,063 | 1,702 | 1,570
Total provision for income taxes | CAD 2.2 | $ 5,700 | $ 4,560 | $ 1,787 | $ 1,654

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