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EMPLOYEE BENEFIT PLANS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value $ 26,073 $ 23,484 $ 19,901
Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 26,073 23,484  
Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 1,326 850  
Cash and cash equivalents | Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 1,326 850  
Cash and cash equivalents | Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Cash and cash equivalents | Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Mutual funds - taxable fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 3,205 3,051  
Mutual funds - taxable fixed income | Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 3,205 3,051  
Mutual funds - taxable fixed income | Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Mutual funds - taxable fixed income | Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Mutual funds - domestic equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 11,422 11,325  
Mutual funds - domestic equity | Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 11,422 11,325  
Mutual funds - domestic equity | Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Mutual funds - domestic equity | Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Mutual funds - international equity      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 6,505 4,889  
Mutual funds - international equity | Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 6,505 4,889  
Mutual funds - international equity | Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Mutual funds - international equity | Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Inflation Hedges/Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 1,364 1,214  
Inflation Hedges/Real Assets | Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 1,364 1,214  
Inflation Hedges/Real Assets | Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Inflation Hedges/Real Assets | Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Hedged Strategies      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 2,251 2,155  
Hedged Strategies | Level I      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 2,251 2,155  
Hedged Strategies | Level II      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value 0 0  
Hedged Strategies | Level III      
Defined Benefit Plan Disclosure [Line Items]      
Assets at fair value $ 0 $ 0