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Deposits (Note)
 12 Months Ended
Dec. 31, 2022
Deposits [Abstract]  
Deposits
5.Deposits and prepaid health insurance
Deposits and prepaid health insurance consisted of the following:
December 31,
(in thousands)20222021
Prepaid health insurance$9,000 $9,000 
Deposits — health insurance7,900 7,900 
Deposits — workers’ compensation196,370 185,027 
Deposits and prepaid health insurance$213,270 $201,927 

The contractual arrangement with United for health insurance coverage requires us to maintain an accumulated cash surplus in the plan of $9.0 million, which is reported as deposits and prepaid health insurance in our Consolidated Balance Sheets. Please read Note 1, “Accounting Policies,” for a discussion of our accounting policies for health insurance costs and workers’ compensation costs.