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LONG-TERM DEBT (Details) - Senior Notes Due March 01, 2028 [Member] - USD ($) $ in Thousands |  | 9 Months Ended
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Feb. 12, 2018 | Sep. 30, 2018
Long-term Debt [Abstract] |  |
Long term debt, face amount | $ 500,000 |
Debt instrument, interest rate, stated percentage | 4.20% |
Credit facility, expiration date | Mar. 01, 2028 |
Periodic payment, interest | $ 10,500 |
Periodic payment, interest, exception of first payment | $ 11,608 |
Cash proceeds received |  | $ 495,019
Original issue discount |  | 705
Debt issuance costs |  | $ 4,276

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