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Other Current Liabilities
 6 Months Ended
Jun. 25, 2021
Accrued Liabilities, Current [Abstract]  
Other Current Liabilities Other Current Liabilities
Components of other current liabilities were as follows (in thousands):
June 25,
2021		December 25,
2020
Accrued self-insurance retentions
$8,209 $8,041 
Accrued warranty and service liabilities
13,748 13,082 
Accrued trade promotions
12,699 12,140 
Payable for employee stock purchases
7,126 14,554 
Customer advances and deferred revenue
57,884 41,689 
Income taxes payable
11,871 8,564 
Right of return refund liability18,072 16,303 
Operating lease liabilities, current 9,760 11,178 
Other
36,780 31,709 
Total
$176,149 $157,260 

A liability is established for estimated future warranty and service claims that relate to current and prior period sales. The Company estimates warranty costs based on historical claim experience and other factors including evaluating specific product warranty issues. Following is a summary of activity in accrued warranty and service liabilities (in thousands):
Balance, December 25, 2020$13,082 
Assumed in business acquisition24 
Charged to expense5,271 
Margin on parts sales reversed1,741 
Reductions for claims settled(6,370)
Balance, June 25, 2021$13,748 

Deferred Revenue

Revenue is deferred when cash payments are received or due in advance of performance, including amounts which are refundable. This is also the case for services associated with certain product sales. The balance in the deferred revenue
and customer advances was $57.9 million as of June 25, 2021 and $41.7 million as of December 25, 2020. Net sales for the year to date included $24.0 million in 2021 and $14.2 million in 2020 that related to deferred revenue as of the beginning of each period.