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DEBT (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Apr. 30, 2015 | Mar. 31, 2020 | Dec. 31, 2019 | Oct. 20, 2016 | Apr. 01, 2015
Debt |  |  |  |  |  |
Borrowings on Line of Credit |  |  | $ 132,378 | $ 34,969 |  |
Revolving credit agreement |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity under the line of credit |  |  | $ 400,000 |  |  |
Covenant compliance description |  |  | As of March 31, 2020, the Company was in compliance with all of its covenants |  |  |
Borrowings on Line of Credit |  |  | $ 115,000 |  |  |
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, Weighted Average Interest Rate |  |  | 3.30% |  |  |
Debt Instrument, Covenant Compliance |  |  | As of March 31, 2020, 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 |  |  | 14 years 1 month 6 days |  |  |
Private Placement [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |
Debt Instrument, Covenant Compliance |  |  | As of March 31, 2020, the Company was in compliance with all of its covenants |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  | $ 700,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term |  |  | 1 year |  |  |
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 |  |  |  |  |  |
Debt |  |  |  |  |  |
Lessee, Operating Lease, Renewal Term |  |  | 11 years |  |  |
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 |  |  |
Maximum | Private Placement [Member] |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt Instrument, Term |  |  | 15 years |  |  |

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