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Inventory valuation. Inventory is valued at the lower of cost or market. We evaluate inventory on a quarterly basis for lower of cost or market and excess and obsolescence and, as necessary, write down the valuation of units to lower of cost or market or for excess and obsolescence based upon the number of units that are unlikely to be sold based upon estimated demand for the following twelve months. This evaluation takes into account matters including expected demand, anticipated sales price, product obsolescence and other factors. If actual future demand for our products is less than currently forecasted, additional inventory adjustments may be required. Once a reserve is established, it is maintained until the product to which it relates is sold or scrapped. If a unit that has been written down is subsequently sold, the cost associated with the revenue from this unit is reduced to the extent of the write down, resulting in an increase in gross profit. We monitor the extent to which previously written down inventory is sold at amounts greater or less than carrying value, and based on this analysis, adjust our estimate for determining future write downs. If in future periods, we experience or anticipate a change in recovery rate compared with our historical experience, our gross margin would be affected. Our provision for inventory was
$9.7 million, $8.6 millionand $3.4 millionin fiscal years 2013, 2012 and 2011, respectively. Accounting for income taxes. We account for income taxes under an asset and liability approach. Deferred income taxes reflect the impact of temporary differences between assets and liabilities recognized for financial reporting purposes and such amounts recognized for income tax reporting purposes, net operating loss carry-forwards and other tax credits measured by applying currently enacted tax laws. Valuation allowances are provided when necessary to reduce deferred tax assets to an amount that is more likely than not to be realized. We recognize the tax liability for uncertain income tax positions on the income tax return based on the two-step process. The first step is to determine whether it is more likely than not that each income tax position would be sustained upon audit. The second step is to estimate and measure the tax benefit as the amount that has a greater than 50% likelihood of being realized upon ultimate settlement with the tax authority. Estimating these amounts requires us to determine the probability of various possible outcomes. We evaluate these uncertain tax positions on a quarterly basis. This evaluation is based on the consideration of several factors, including changes in facts or circumstances, changes in applicable tax law, settlement of issues under audit and new exposures. If we later determine that our exposure is lower or that the liability is not sufficient to cover our revised expectations, we adjust the liability and effect a related change in our tax provision during the period in which we make such determination. See Note 11 of Notes to Consolidated Financial Statements for the impact on our consolidated financial statements. Stock-based compensation. We measure and recognize the compensation expense for all share-based awards made to employees and non-employee members of the Board of Directors including employee stock options and restricted stock awards based on estimated fair values. We are required to estimate the fair value of share-based awards on the date of grant. The value of awards that are ultimately expected to vest is recognized as an expense over the requisite service periods. Compensation expense for options and restricted stock awards granted to employees was $11.4 million, $10.3 millionand $8.1 millionfor the years ended June 30, 2013, 2012 and 2011, respectively.