| http://www.w3.org/ns/prov#value | - We regularly evaluate our performance as compared to other coal companies that have different financing and capital structures and/or tax rates by using EBITDA. We believe that EBITDA allows for meaningful company-to-company performance comparisons by adjusting for factors such as interest expense, depreciation, depletion, amortization and taxes, which can vary from company to company.
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