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DEBT (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2016 | Dec. 31, 2015
Debt |  |  |  |
Short-term Bank Loans and Notes Payable |  |  | $ 159,908 | $ 4,278
Unamortized Debt Issuance Expense |  |  | 825 |
Revolving credit agreement |  |  |  |
Debt |  |  |  |
Borrowing capacity under the line of credit |  |  | $ 400,000 |
Line of Credit Facility, Initiation Date |  | Sep. 12, 2014 |  |
Covenant compliance description |  |  | As of June 30, 2016, the Company was in compliance with all of its covenants |
Short-term Bank Loans and Notes Payable |  |  | $ 135,000 |
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 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 June 30, 2016, the Company was in compliance with all of its debt covenants |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | $ 349,175 |
Weighted Average [Member] |  |  |  |
Debt |  |  |  |
Debt Instrument, Term |  |  | 19 years |
Minimum [Member] | Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt Instrument, Term |  |  | 10 years |
Maximum | Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt Instrument, Term |  |  | 30 years |
Senior Notes Series A [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 B [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 C [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 D [Member] |  |  |  |
Debt |  |  |  |
Debt Instrument, Maturity Date |  |  | Apr. 01, 2045 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.02% |
Debt Instrument, Face Amount |  |  | $ 100,000 |

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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=6479336&loc=d3e64711-112823 + 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 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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