DEBT (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 975,000
Less: Deferred financing costs	(2,715)
Long-term debt, net of deferred financing costs	972,285	$ 1,022,004
Term Credit Agreement borrowings due 2024 at a variable interest rate of 3.6% at September 30, 2017
Debt Instrument [Line Items]
Total debt	$ 350,000
Effective interest rate	3.60%
Debt instrument, interest rate during period	3.30%
Term Credit Agreement borrowings due 2024 at a variable interest rate of 3.6% at September 30, 2017 \| LIBOR
Debt Instrument [Line Items]
Basis points on periodic interest rate	1.625%
Senior Notes due 2022 at a fixed interest rate of 3.75%
Debt Instrument [Line Items]
Total debt	$ 325,000
Fixed interest rate	3.75%
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 3.9% at September 30, 2017
Debt Instrument [Line Items]
Total debt	$ 300,000
Effective interest rate	3.90%
Debt instrument, interest rate during period	2.80%
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 3.9% at September 30, 2017 \| LIBOR
Debt Instrument [Line Items]
Basis points on periodic interest rate	1.90%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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