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DEBT (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Oct. 31, 2016 | Apr. 30, 2015 | Mar. 31, 2018 | Oct. 20, 2016 | Apr. 01, 2015
Debt |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Jun. 30, 2022 |  |
Revolving credit agreement |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity under the line of credit |  |  |  | $ 400,000 |  |
Line of Credit Facility, Initiation Date | Jun. 30, 2017 |  |  |  |  |
Covenant compliance description |  |  |  | As of March 31, 2018, the Company was in compliance with all of its covenants |  |
Additional increase in borrowing capacity of the line of credit available at the entity's option |  |  |  | $ 100,000 |  |
Debt Instrument, Term |  |  |  | 5 years |  |
Senior Notes [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 3.30% |  |
Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Initiation Date |  |  | Apr. 01, 2015 |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 350,000
Debt, Weighted Average Interest Rate |  |  |  |  |  | 3.50%
Debt Instrument, Covenant Compliance |  |  |  | As of March 31, 2018, the Company was in compliance with all of its debt covenants |  |
Weighted Average [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  | 18 years | 19 years | 18 years |  |
Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Initiation Date |  | Oct. 20, 2016 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 350,000 |
Debt, Weighted Average Interest Rate |  |  |  |  | 3.10% |
Debt Instrument, Covenant Compliance |  |  |  | As of March 31, 2018, the Company was in compliance with all of its debt covenants |  |
Minimum [Member] | Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  |  | 10 years |  |  |
Minimum [Member] | Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  | 12 years |  |  |  |
Maximum | Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  |  | 30 years |  |  |
Maximum | Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  | 25 years |  |  |  |
Senior Notes Series A [Member] | Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Aug. 20, 2025 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.15% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |
Senior Notes Series A [Member] | Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Oct. 20, 2028 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.75% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |
Senior Notes Series B [Member] | Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Aug. 20, 2030 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.35% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |
Senior Notes Series B [Member] | Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Oct. 20, 2033 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.03% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |
Senior Notes Series C [Member] | Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Apr. 01, 2035 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.61% |  |
Debt Instrument, Face Amount |  |  |  | $ 50,000 |  |
Senior Notes Series C [Member] | Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Oct. 20, 2037 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.27% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |
Senior Notes Series D [Member] | Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Apr. 01, 2045 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.02% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |
Senior Notes Series D [Member] | Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Oct. 20, 2041 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.52% |  |
Debt Instrument, Face Amount |  |  |  | $ 50,000 |  |

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- Definition Represents the amount that the borrowing capacity of the line of credit may be increased at the entity's option, subject to certain conditions, under the terms of the credit agreement. + References No definition available. + Details
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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://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=75038535&loc=d3e64711-112823 + Details
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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. + Details
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