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LONG-TERM DEBT (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2017 | Jan. 01, 2017
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | $ 630,000 |  | $ 600,000
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | 30,000 |  | 0
Maximum borrowing capacity | 1,000,000 | $ 1,000,000 |
Amount committed against facility to cover various letters of credit | $ 14,600 |  | 19,000
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.30% |  |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% | Minimum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 1.00% |  |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% | Maximum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 2.00% |  |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25% |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | $ 0 |  | 0
Maximum borrowing capacity | $ 300,000 | $ 300,000 |
Revolving period | 1 year |  |
Term-out period | 1 year |  |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25% | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.10% |  |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25% | Minimum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 1.00% |  |
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25% | Maximum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 1.25% |  |
Term loan, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | $ 300,000 |  | 300,000
Borrowings maturity term | 5 years |  |
Term loan, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.20% |  |
Term loan, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% | Minimum | LIBOR |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 1.00% |  |
Term loan, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% | Maximum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 2.00% |  |
Notes payable, interest at fixed and variable rates |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | $ 300,000 |  |
Notes payable, interest at fixed rate of 2.70%, payable semi-annually |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.70% |  |
Principal amount | $ 100,000 |  | 100,000
Notes payable, interest at fixed rate of 2.70%, payable semi-annually | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.70% |  |
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.53% payable quarterly |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | $ 50,000 |  | 50,000
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.53% payable quarterly | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.70% |  |
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.53% payable quarterly | LIBOR |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 1.53% |  |
Notes payable, interest at fixed rate of 2.91%, payable semi-annually |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.91% |  |
Principal amount | $ 100,000 |  | 100,000
Notes payable, interest at fixed rate of 2.91%, payable semi-annually | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.90% |  |
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.57% payable quarterly |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal amount | $ 50,000 |  | $ 50,000
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.57% payable quarterly | Effective interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.90% |  |
Notes payable, interest at variable U.S. LIBOR-based interest rate plus a spread of 1.57% payable quarterly | LIBOR |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 1.57% |  |

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