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SUBSEQUENT EVENTS (Details) - Senior Notes Due 2028 - Unsecured Debt - Subsequent Event	Apr. 09, 2018 USD ($)
Subsequent Event [Line Items]
Debt instrument, face amount	$ 600,000,000
Percentage of debt issuance price	99.402%
Proceeds from issuance of debt	$ 592,500,000
Debt instrument, interest rate, stated percentage	4.20%
Expenses from issuance of debt	$ 5,500,000
Debt issuance costs, related to underwriting	$ 3,900,000
Effective yield to maturity	4.385%
Debt instrument, redemption price, percentage	101.00%
Percent of principal amount outstanding held by trustee or holders	25.00%

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- Definition

Debt Instrument, Covenant Percent Of Principal Amount Outstanding Held By Trustee Or Holders, That May Deem Notes Due And Payable

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Debt Instrument, Percentage Of Debt Issuance Price

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Debt Issuance Costs, Underwriting, Gross

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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-Paragraph 14
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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