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DEBT (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Oct. 31, 2016 | Apr. 30, 2015 | Jun. 30, 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 June 30, 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% |  |
Debt Instrument, Covenant Compliance |  |  |  | As of June 30, 2018, the Company was in compliance with all of its debt covenants |  |
Senior Notes 2015 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Initiation Date |  |  | Apr. 01, 2015 |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 350,000
Senior Notes 2016 [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Initiation Date |  | Oct. 20, 2016 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 350,000 |
Weighted Average [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 18 years |  |
Minimum [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Aug. 20, 2025 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.75% |  |
Debt Instrument, Face Amount |  |  |  | $ 50,000 |  |
Maximum | Senior Notes [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Apr. 01, 2045 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.02% |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000 |  |

X
- 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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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 + Details
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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 + 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/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 + 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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- Definition Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: 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(19)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: 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 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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