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FAIR VALUE MEASUREMENTS - Level 3 (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Changes in contingent consideration liability    
Liability, beginning balance $ 9,900 $ 10,100
Noncash changes in fair value $ (10,989) $ (1,650)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization
Payments $ (7,789) $ (1,850)
Liability, ending balance $ 13,100 $ 9,900
Measurement Input, Cost of Debt | Minimum    
Fair value measurement input    
Contingent consideration, Measurement input 0.0651 0.0727
Measurement Input, Cost of Debt | Maximum    
Fair value measurement input    
Contingent consideration, Measurement input 0.0856 0.0908
Measurement input, Coal price volatility    
Fair value measurement input    
Contingent consideration, Measurement input 0.062 0.063
Measurement input, Market price of risk adjustment    
Fair value measurement input    
Contingent consideration, Measurement input 0.062 0.078