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EARNINGS PER SHARE Accelerated Share Repurchase (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Accelerated Share Repurchases [Line Items] |  |  |
Payments for Repurchase of Common Stock | $ (27,055) | $ (106,702) |
Stock Repurchase Program, Authorized Amount | $ 300,000 |  |
Treasury Stock, Shares, Acquired | 351,821 |  |
Stock Repurchase Program Expiration Date | Dec. 31, 2020 |  | Dec. 31, 2017
Treasury Stock, Common [Member] |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Payments for Repurchase of Common Stock | $ (25,000) | $ (100,000) |
Treasury Stock, Shares, Acquired |  | 1,778,537 |

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