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EMPLOYEE BENEFIT PLANS (Details 8) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 3,257 | $ 23,603 | $ 213,699
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1,322 | 17,071 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1,935 | 1,835 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 4,697 |
Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 1,322 | 17,071 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 1,322 | 17,071 |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] |  |  |
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] |  |  |
Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 480 | 499 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] |  |  |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] | 480 | 499 |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [2] |  |  |
Domestic equity - all other [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 932 | 899 |
Domestic equity - all other [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  |
Domestic equity - all other [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 932 | 899 |
Domestic equity - all other [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  |
International equity [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 523 | 437 |
International equity [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] |  |  |
International equity [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] | 523 | 437 |
International equity [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [3] |  |  |
Real Estate [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] |  | 2,235 |
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] |  |  |
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] |  |  |
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [4] |  | 2,235 |
Alternative/Opportunistic/Special [member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] |  | 2,462 |
Alternative/Opportunistic/Special [member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] |  |  |
Alternative/Opportunistic/Special [member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] |  |  |
Alternative/Opportunistic/Special [member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [5] |  | $ 2,462 |
[1] | Cash and cash equivalents, which are used to pay benefits and plan administrative expenses, are held in Rule 2a-7 money market funds.
[2] | Fixed income securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported trades.
[3] | Domestic and international equity securities are valued using a market approach based on the quoted market prices of identical instruments in their respective markets.
[4] | Real estate fund values are primarily reported by the fund manager and are based on valuation of the underlying investments, which include inputs such as cost, discounted future cash flows, independent appraisals and market-based comparable data.
[5] | Alternative/Opportunistic/Special funds can invest across the capital structure in both liquid and illiquid securities that are valued using a market approach based on the quoted market prices of identical instruments, or if no market price is available, instruments will be held at their fair market value (which may be cost) as reasonably determined by the investment manager, independent dealers, or pricing services.

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