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PENSION AND RETIREMENT PLANS - Components of net periodic cost (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
EMPLOYEE BENEFIT PLANS |  |
Settlement loss |  | $ 2,089
Retirement Income Plan |  |
EMPLOYEE BENEFIT PLANS |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense
Retirement Income Plan | Affiliated Entity | RPC |  |
EMPLOYEE BENEFIT PLANS |  |
Interest cost |  | $ 4
Amortization of net losses |  | 22
Settlement loss |  | 2,089
Net periodic cost |  | $ 2,115

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