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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Changes in the Allowance for Doubtful Accounts The following table presents the changes in expected losses (in thousands):
Years ended December 31,
202120202019
Balance at beginning of year$536 $670 $665 
Expected losses10 362 282 
Write-offs, net of recoveries(117)(496)(277)
Balance at end of year$429 $536 $670 
Prepaid Expenses and Other Current Assets Prepaid expenses and other as of December 31, 2021 and 2020 consists of the following (in thousands):
December 31,
20212020
Chassis converter pool agreements$18,185 $17,767 
Income tax receivables10,386 18,073 
Insurance premiums & maintenance/subscription agreements3,290 4,384 
Assets held for sale350 1,897 
Commodity swap contracts7,963 13,750 
All other3,621 7,165 
$43,795 $63,036 
Schedule of Product Warranty Liability
The following table presents the changes in the product warranty accrual included in Other accrued liabilities (in thousands):
20212020
Balance as of January 1$20,570 $22,575 
Provision for warranties issued in current year5,061 4,334 
Net adjustment to warranty accrual(170)(228)
Payments(3,416)(6,111)
Balance as of December 31$22,045 $20,570 
Changes in the Self-Insurance Accrual Included in Other Accrued Liabilities
The following table presents the changes in the self-insurance accrual included in Other accrued liabilities (in thousands):
20212020
Balance as of January 1$12,086 $12,934 
Expense33,941 47,612 
Payments(34,875)(48,460)
Balance as of December 31$11,152 $12,086