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RETIREMENT AND DEFERRED COMPENSATION PLANS (Schedule of Estimated Benefit Payments to Defined Benefit Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
United States |  |  |
Defined contribution plan |  |  |
Total contributions by Company | $ 3,300 | $ 3,100 | $ 3,000
Estimated benefit payments relating to defined benefit plans over the next ten years |  |  |
2018 | 9,960 |  |
2019 | 9,922 |  |
2020 | 10,471 |  |
2021 | 11,037 |  |
2022 | 11,634 |  |
2023 - 2027 | $ 67,818 |  |
United States | Maximum |  |  |
Defined contribution plan |  |  |
Employer matching contribution as a percentage of salary | 3.00% |  |
Foreign Plans |  |  |
Defined contribution plan |  |  |
Total contributions by Company | $ 2,200 | $ 1,900 | $ 2,100
Estimated benefit payments relating to defined benefit plans over the next ten years |  |  |
2018 | 2,194 |  |
2019 | 3,344 |  |
2020 | 3,510 |  |
2021 | 3,455 |  |
2022 | 3,638 |  |
2023 - 2027 | $ 30,389 |  |

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