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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 12,859 | $ 11,199 | $ 29,839 | $ 32,884 |
Effective tax rate | 20.20% | 31.10% | 20.20% | 31.40% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 35.00% |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 2,900 |  | $ 2,900 |  | $ 2,900

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