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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, 2020 | Dec. 31, 2019 | Oct. 20, 2016 | Apr. 01, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts due banks |  |  | $ 2,623 | $ 34,857 |  |
Fair value of long-term debt |  |  | $ 793,591 | $ 721,494 |  |
Senior Notes 2016 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 350,000 |
Debt Instrument, Issuance Date | Oct. 20, 2016 |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 3.30% |  |  |
Debt Instrument, Covenant Compliance |  |  | As of December 31, 2020, the Company was in compliance with all of its debt covenants. |  |  |
Weighted Average [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  | 13 years 4 months 24 days |  |  |
Senior Notes 2015 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 350,000
Debt Instrument, Issuance Date |  | Apr. 01, 2015 |  |  |  |
Minimum | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.80% |  |  |
Maximum | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |  |
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 A [Member] | Senior Notes 2015 [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 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 B [Member] | Senior Notes 2015 [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 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 C [Member] | Senior Notes 2015 [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 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% |  |  |
Senior Notes Series D [Member] | Senior Notes 2015 [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% |  |  |

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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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/disclosureRef -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=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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. + References No definition available. + Details
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