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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial Instruments [Abstract] |
Disclosure of detailed information about borrowings | LONG-TERM DEBT:
| Effective interest rate (1) | Principal amount | Maturity date
| December 31, 2017 |  | January 1, 2017 |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% (2) | 2.3% | $ | 30,000 |  | $ | — |  | April 2022
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25% (3) | 2.1% | — |  | — |  | March 2019
Term loan, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% (4) | 2.2% | 300,000 |  | 300,000 |  | June 2021
Notes payable, interest at fixed rate of 2.70%, payable semi-annually (5) | 2.7% | 100,000 |  | 100,000 |  | August 2023
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.53% payable quarterly (5) | 2.7% | 50,000 |  | 50,000 |  | August 2023
Notes payable, interest at fixed rate of 2.91%, payable semi-annually (5) | 2.9% | 100,000 |  | 100,000 |  | August 2026
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.57% payable quarterly (5) | 2.9% | 50,000 |  | 50,000 |  | August 2026
|  | $ | 630,000 |  | $ | 600,000 |  |
(1) | Represents the effective interest rate for the year ended December 31, 2017, including the cash impact of interest rate swaps, where applicable.
(2) | The Company’s unsecured revolving long-term bank credit facility of $1 billion provides for an annual extension which is subject to the approval of the lenders. The spread added to the U.S. LIBOR-based variable interest rate is a function of the total net debt to EBITDA ratio (as defined in the credit facility agreement). In addition, an amount of $14.6 million (January 1, 2017 - $19.0 million) has been committed against this facility to cover various letters of credit.
(3) | The Company's unsecured revolving long-term bank credit facility agreement of $300 million, has a one year revolving period followed by a one year term-out period, and provides for an annual extension of the revolving period which is subject to the approval of the lenders. A fixed spread of 1% during the revolving period and 1.25% during the term-out period is added to the U.S. LIBOR-based variable interest rate.
(4) | The unsecured five-year term loan of $300 million is non-revolving and can be prepaid in whole or in part at any time with no penalties. The spread added to the U.S. LIBOR-based variable interest rate is a function of the total net debt to EBITDA ratio (as defined in the term loan agreement).
(5) | The unsecured notes issued for a total aggregate principal amount of $300 million to accredited investors in the U.S. private placement market can be prepaid in whole or in part at any time, subject to the payment of a prepayment penalty as provided for in the Note Purchase Agreement.

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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition The disclosure of detailed information about borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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