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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, 2017 | Dec. 31, 2016 | Oct. 20, 2016 | Apr. 01, 2015
Debt |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Jun. 30, 2022 |  |  |
Short-term Bank Loans and Notes Payable | $ 1,953 |  |  | $ 1,953 | $ 1,889 |  |
Revolving credit agreement |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Borrowing capacity under the line of credit | $ 400,000 |  |  | $ 400,000 |  |  |
Line of Credit Facility, Initiation Date | Jun. 30, 2017 |  |  |  |  |  |
Covenant compliance description |  |  |  | As of June 30, 2017, 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 |  |  | $ 100,000 |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | 3.30% |  |  | 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 June 30, 2017, the Company was in compliance with all of its debt covenants |  |  |
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% |
Weighted Average [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt Instrument, Term |  | 18 years | 19 years | 18 years |  |  |
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% |  |  | 3.15% |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  | $ 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% |  |  | 2.75% |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  | $ 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% |  |  | 3.35% |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  | $ 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% |  |  | 3.03% |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  | $ 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% |  |  | 3.61% |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |  | $ 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% |  |  | 3.27% |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  | $ 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% |  |  | 4.02% |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  | $ 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% |  |  | 3.52% |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |  | $ 50,000 |  |  |

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