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LONG-TERM DEBT | 12 Months Ended
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Dec. 31, 2017
Financial Instruments [Abstract] |
LONG-TERM DEBT | 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.
In March 2017, the Company amended its unsecured revolving long-term bank credit facility of $1 billion to extend the maturity date from April 2021 to April 2022, and amended its unsecured revolving long-term bank credit facility agreement of $300 million to extend the maturity date from March 2018 to March 2019. 11. LONG-TERM DEBT (continued): Under the terms of the revolving facilities, term loan facility, and notes, the Company is required to comply with certain covenants, including maintenance of financial ratios. The Company was in compliance with all financial covenants at December 31, 2017.

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