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EMPLOYEE BENEFIT PLANS - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 73,619 | $ 81,899 | $ 67,967
Other Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 73,619 | 80,805 |
Other Pension Plan | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,119 | 651 |
Other Pension Plan | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 72,500 | 80,154 |
Other Pension Plan | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,119 | 651 |
Other Pension Plan | Cash | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,119 | 651 |
Other Pension Plan | Equity Index |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 2,785 |
Other Pension Plan | Equity Index | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | Equity Index | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 2,785 |
Other Pension Plan | Diversified Growth Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 12,330 | 17,296 |
Other Pension Plan | Diversified Growth Fund | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | Diversified Growth Fund | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 12,330 | 17,296 |
Other Pension Plan | Global Equity Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,835 |  |
Other Pension Plan | Global Equity Fund | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,835 |  |
Other Pension Plan | Global Absolute Return Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 6,534 |
Other Pension Plan | Global Absolute Return Fund | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | Global Absolute Return Fund | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 6,534 |
Other Pension Plan | Cash Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 5,315 |
Other Pension Plan | Cash Fund | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | Cash Fund | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 5,315 |
Other Pension Plan | Global Absolute Return Bond Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 18,570 |  |
Other Pension Plan | Global Absolute Return Bond Fund | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 18,570 |  |
Other Pension Plan | Corporate Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 7,472 |  |
Other Pension Plan | Corporate Bonds | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 7,472 |  |
Other Pension Plan | United Kingdom | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 17,809 |
Other Pension Plan | United Kingdom | Equity Securities | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | United Kingdom | Equity Securities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 17,809 |
Other Pension Plan | United Kingdom | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 18,048 | 6,494 |
Other Pension Plan | United Kingdom | Fixed Income Securities | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | United Kingdom | Fixed Income Securities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 18,048 | 6,494 |
Other Pension Plan | United Kingdom | Government Index Linked Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 14,245 | 8,934 |
Other Pension Plan | United Kingdom | Government Index Linked Securities | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | United Kingdom | Government Index Linked Securities | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 14,245 | 8,934 |
Other Pension Plan | United States | Equity Index |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 4,370 |
Other Pension Plan | United States | Equity Index | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | United States | Equity Index | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 4,370 |
Other Pension Plan | European | Equity Index |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 4,378 |
Other Pension Plan | European | Equity Index | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | European | Equity Index | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 4,378 |
Other Pension Plan | Pacific Rim | Equity Index |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 3,506 |
Other Pension Plan | Pacific Rim | Equity Index | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | Pacific Rim | Equity Index | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 3,506 |
Other Pension Plan | JAPAN | Equity Index |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 2,733 |
Other Pension Plan | JAPAN | Equity Index | Quoted Prices in Active Markets for Identical Items (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | 0 |
Other Pension Plan | JAPAN | Equity Index | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  | $ 2,733 |

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