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Other Current Liabilities
 3 Months Ended
Apr. 01, 2022
Accrued Liabilities, Current [Abstract]  
Other Current Liabilities Other Current Liabilities
Components of other current liabilities were as follows (in thousands):
April 1,
2022		December 31,
2021
Accrued self-insurance retentions
$11,576 $9,303 
Accrued warranty and service liabilities
14,560 14,463 
Accrued trade promotions
10,141 15,872 
Payable for employee stock purchases
3,921 15,746 
Customer advances and deferred revenue
66,668 60,554 
Income taxes payable
12,481 5,200 
Right of return refund liability18,713 18,614 
Operating lease liabilities, current 9,449 9,096 
Other
43,049 42,311 
Total
$190,558 $191,159 

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 31, 2021$14,463 
Assumed in business acquisition38 
Charged to expense2,043 
Margin on parts sales reversed791 
Reductions for claims settled(2,775)
Balance, April 1, 2022$14,560 

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 $66.7 million as of April 1, 2022 and $60.6 million as of December 31, 2021. Net sales for the year to date included $22.5 million in 2022 and $40.9 million in 2021 that related to deferred revenue as of the beginning of each period.