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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2020
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,
202020192018
Balance at beginning of year$670 $665 $869 
Expected losses362 282 63 
Write-offs, net of recoveries(496)(277)(267)
Balance at end of year$536 $670 $665 
Prepaid Expenses and Other Current Assets Prepaid expenses and other as of December 31, 2020 and 2019 consists of the following (in thousands):
December 31,
20202019
Chassis converter pool agreements$17,767 $10,164 
Income tax receivables18,073 8,701 
Insurance premiums & maintenance agreements4,384 3,217 
Assets held for sale1,897 3,020 
All other20,915 16,120 
$63,036 $41,222 
Schedule of Product Warranty Liability
The following table presents the changes in the product warranty accrual included in Other accrued liabilities (in thousands):
20202019
Balance as of January 1$22,575 $22,247 
Provision for warranties issued in current year4,334 8,027 
Net adjustment to warranty accrual(228)(2,320)
Payments(6,111)(5,379)
Balance as of December 31$20,570 $22,575 
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):
20202019
Balance as of January 1$12,934 $9,890 
Expense47,612 57,733 
Payments(48,460)(54,689)
Balance as of December 31$12,086 $12,934