Management uses a variety of measures to evaluate the company’s performance. While the consolidated financial statements provide an understanding of the company’s overall results of operations, financial condition and cash flows, management analyzes components of the consolidated financial statements to identify certain trends and evaluate specific performance areas. In addition to using U.S. generally accepted accounting principles (“GAAP”) financial measures, management uses EBITDA and EBITDA adjusted for items which management believes are not indicative of the company’s ongoing operating performance (“adjusted EBITDA”), both non-GAAP financial measures, to evaluate the operating performance of the company’s core business operations because its resource allocation, financing methods and cost of capital, and income tax positions, which are managed at a corporate level, apart from the activities of the operating segments, and the operating facilities are located in different taxing jurisdictions, which can cause considerable variation in net earnings. The company also uses EBITDA and adjusted EBITDA to assess its operating performance and return on capital, and to evaluate potential acquisitions or other capital projects. EBITDA and adjusted EBITDA are not calculated under GAAP and should not be considered in isolation or as a substitute for net earnings, cash flows or other financial data prepared in accordance with GAAP or as a measure of overall profitability or liquidity. EBITDA and adjusted EBITDA exclude interest expense, income taxes and depreciation and amortization, each of which is an essential element of the company’s cost structure and cannot be eliminated. Consequently, any measure that excludes these elements has material limitations. While EBITDA and adjusted EBITDA are frequently used as measures of operating performance, these terms are not necessarily comparable to similarly titled measures of other companies due to the potential inconsistencies in the method of calculation. The calculations of EBITDA and adjusted EBITDA as used by management are set forth in the following table.