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Contingencies and Commitments (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Undiscounted reserve
The undiscounted reserve balance at the beginning of the year, the amounts expensed and paid, and the balance at December 31, 2022 and 2021 are as follows:
(Thousands)20222021
Reserve balance at beginning of year$4,770 $5,476 
Expensed180 185 
Paid(480)(891)
Reserve balance at end of year$4,470 $4,770 
Ending balance recorded in:
Other liabilities and accrued items$440 $539 
Other long-term liabilities4,030 4,231 
Schedule of asset retirement obligations
Asset Retirement Obligations
The Company has asset retirement obligations related to its mine in Utah, as well as for certain leased facilities where the Company is contractually obligated to restore the facility back to its original condition at the end of the lease. The following represents a roll forward of the Company's asset retirement obligation liabilities for the years ended December 31, 2022 and 2021:
(Thousands)20222021
Asset retirement obligation at beginning of period$2,231 $1,765 
Accretion expense198 134 
Change in liability— 332 
Asset retirement obligation at end of period$2,429 $2,231