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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract] |  |  |
Maturity of Canadian government securities | 90 days | 90 days | 90 days

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- Definition Maturity Period Used to Classify Investments + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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