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EMPLOYEE BENEFIT PLANS Defined Benefit Plan, Fair Value on Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | $ 141,816 | $ 130,078 | $ 144,349
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 136,459 | 122,025 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 5,357 | 8,053 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 141,816 | 130,078 |
Cash | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 195 | 216 |
Cash | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Cash | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Cash | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 195 | 216 |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 5,357 | 8,053 |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 5,357 | 8,053 |
Fixed income mutual funds | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 75,720 | 74,453 |
Fixed income mutual funds | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Fixed income mutual funds | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Fixed income mutual funds | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 75,720 | 74,453 |
Equity mutual funds | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 60,544 | 47,356 |
Equity mutual funds | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Equity mutual funds | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | 0 | 0 |
Equity mutual funds | Fair Value, Inputs, Level 1, 2 and 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fair value measurements | $ 60,544 | $ 47,356 |

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