Capitalized software is amortized over its estimated useful life (generally 2 to 5 years) beginning at date of implementation.
Other Current Liabilities. Components of other current liabilities were (in thousands):
Accrued self-insurance retentions
Accrued warranty and service liabilities
Accrued trade promotions
Payable for employee stock purchases
Customer advances and deferred revenue
Income taxes payable
Self-Insurance. The Company is self-insured for certain losses and costs relating to product liability, workers’ compensation, employee medical benefit claims and representations and warranties associated with the Liquid Finishing business divestiture. The Company has stop-loss coverage in order to limit its exposure to significant claims. Accrued self-insurance retentions are based on claims filed, estimates of claims incurred but not reported, and other actuarial assumptions. Self-insured reserves totaled $9.8 million as of December 30, 2016, and $11.2 million as of December 25, 2015, including $2.7 million and $4.3 million, respectively, classified as other long-term liabilities in the Consolidated Balance Sheets. A portion of our self-insured losses are managed through a wholly-owned captive insurance subsidiary.
Product Warranties. 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, beginning of year
Charged to expense
Margin on parts sales reversed
Reductions for claims settled
Balance, end of year
Revenue Recognition. Sales are recognized when revenue is realized or realizable and has been earned. The Company’s policy is to recognize revenue when risk and title passes to the customer. This is generally on the date of shipment, however certain sales have terms requiring recognition when received by the customer. In cases where there are specific customer acceptance provisions, revenue is recognized at the later of customer acceptance or shipment (subject to shipping terms). Payment terms are established based on the type of product, distributor capabilities and competitive market conditions. Rights of return are typically contractually limited, amounts are estimable, and the Company records provisions for anticipated returns and warranty claims at the time revenue is recognized. Historically, sales returns have been less than 3 percent of sales. Provisions for sales returns are recorded as a reduction of net sales, and provisions for warranty claims are recorded in selling, marketing and distribution expenses. From time to time, the Company may promote the sale of new products by agreeing to accept returns of superseded products. In such cases, provisions for estimated returns are recorded as a reduction of net sales.
Trade promotions are offered to distributors and end users through various programs, generally with terms of one year or less. Such promotions include cooperative advertising arrangements, rebates based on annual purchases and sales growth, coupons and reimbursement for competitive products. Payment of incentives may take the form of cash, trade credit, promotional merchandise or free product. Under cooperative advertising arrangements, the Company reimburses the distributor for a portion of its advertising costs related to the Company’s products; estimated costs are accrued at the time of sale and classified as selling, marketing and distribution expense. Rebates are accrued based on the program rates and progress toward the estimated annual sales amount and sales growth, and are recorded as a reduction of sales (cash, trade credit) or cost of products sold (free goods). The estimated costs related to coupon programs are accrued at the time of sale and classified as selling, marketing and distribution expense or cost of products sold, depending on the type of incentive offered.