Constant Currency Presentation
We evaluate our results of operations on both an as reported and a constant currency basis. The constant currency presentation, which is a non-GAAP measure, excludes the impact of fluctuations in foreign currency exchange rates. We believe providing constant currency information provides valuable supplemental information regarding our results of operations, consistent with how we evaluate our performance. We calculate constant currency percentages by converting our prior-period local currency financial results using the current period exchange rates and comparing these adjusted amounts to our current period reported results.
Adjusted EBITDA and Adjusted Net Income
We define Adjusted EBITDA as net income or loss from our consolidated statements of operations before interest income and expense, income taxes, depreciation and amortization, restructuring charges, goodwill and intangible asset impairment charges, stock compensation expense and other non-operating items from our consolidated statements of operations as well as certain other items considered unusual or non-recurring in nature. We use Adjusted EBITDA to measure our performance from period to period both at the consolidated level as well as within our operating segments, to evaluate and fund incentive compensation programs and to compare our results to those of our competitors.
We define Adjusted Net Income as net income or loss from our consolidated statements of operations before income taxes, depreciation and amortization associated with acquired tangible and intangible assets, restructuring charges, goodwill and intangible asset impairment charges, other non-operating items from our consolidated statements of operations and certain other items considered unusual or non-recurring in nature, reduced by cash paid for income taxes. Also excluded from Adjusted Net Income is interest expense attributable to the mandatory convertible subordinated bonds due 2013. Adjusted Net Income per share of common stock presented on a diluted basis includes potential common shares associated with stock-based compensation plans that may have been considered anti-dilutive in accordance with GAAP. The amount also includes the weighted-average amount of shares of common stock convertible associated with the mandatory convertible bonds based upon the average price of our common stock during the period.