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DEBT (Long-Term Debt) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2016	Apr. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Oct. 20, 2016	Apr. 01, 2015
Debt Instrument [Line Items]
Amounts due banks, interest at 31.8% (29.0% in 2016)			$ 2,020	$ 1,758
Fair value of long-term debt			$ 687,428	$ 669,209
Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate					3.10%
Debt Instrument, Face Amount					$ 350,000
Debt Instrument, Issuance Date	Oct. 20, 2016
Debt Instrument, Covenant Compliance			As of December 31, 2017, the Company was in compliance with all of its debt covenants
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			3.30%
Weighted Average [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	18 years	19 years	18 years
Senior Notes 2015 [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate						3.50%
Debt Instrument, Face Amount						$ 350,000
Debt Instrument, Issuance Date		Apr. 01, 2015
Debt Instrument, Covenant Compliance			As of December 31, 2017, the Company was in compliance with all of its debt covenants
Minimum | Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	12 years
Minimum | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			2.80%
Minimum | Senior Notes 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Term		10 years
Maximum | Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	25 years
Maximum | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Maximum | Senior Notes 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Term		30 years
Senior Notes Series A [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Aug. 20, 2025
Debt Instrument, Interest Rate, Stated Percentage			3.15%
Senior Notes Series A [Member] | Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Oct. 20, 2028
Debt Instrument, Interest Rate, Stated Percentage			2.75%
Senior Notes Series B [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Aug. 20, 2030
Debt Instrument, Interest Rate, Stated Percentage			3.35%
Senior Notes Series B [Member] | Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Oct. 20, 2033
Debt Instrument, Interest Rate, Stated Percentage			3.03%
Senior Notes Series C [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 50,000
Debt Instrument, Maturity Date			Apr. 01, 2035
Debt Instrument, Interest Rate, Stated Percentage			3.61%
Senior Notes Series C [Member] | Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Oct. 20, 2037
Debt Instrument, Interest Rate, Stated Percentage			3.27%
Senior Notes Series D [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Apr. 01, 2045
Debt Instrument, Interest Rate, Stated Percentage			4.02%
Senior Notes Series D [Member] | Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 50,000
Debt Instrument, Maturity Date			Oct. 20, 2041
Debt Instrument, Interest Rate, Stated Percentage			3.52%

X

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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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

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
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