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EMPLOYEE BENEFIT PLANS - Amounts Recognized in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Pension Benefits |  |
Employee benefit plans |  |
Noncurrent assets | $ 0 | $ 0
Accrued benefit costs | (104) | 62
Accrued benefit liability | (117,145) | (238,454)
Regulatory assets | 58,101 | 187,930
Regulatory liabilities | 0 | 0
Net amount recognized | (59,148) | (50,462)
Other Benefits |  |
Employee benefit plans |  |
Noncurrent assets | 16,399 | 0
Accrued benefit costs | (1,782) | (2,441)
Accrued benefit liability | 0 | (21,961)
Regulatory assets | 1,487 | 20,392
Regulatory liabilities | (18,472) | 0
Net amount recognized | $ (2,368) | $ (4,010)

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