The Company believes that it continues to maintain a strong liquidity position, with $96.5 million in available borrowing capacity under its $250.0 million revolving credit facility as of March 31, 2013. In addition, the Company's credit facility can be increased up to $325.0 million under certain conditions. The Company's outstanding indebtedness as of March 31, 2013 consisted of $200.0 million in senior subordinated notes due 2018, $151.4 million in borrowings under its revolving credit facility due 2016, and $2.6 million in equipment financing notes associated with its majority-owned Mexico subsidiary.
DISCLOSURE OF NON-GAAP FINANCIAL INFORMATION
Adjusted EBITDA, Adjusted Net Income, Adjusted Net Income per diluted share, and Free Cash Flow are non-GAAP financial measures provided as a complement to results prepared in accordance with accounting principles generally accepted within the United States of America ("GAAP") and may not be comparable to similarly-titled measures reported by other companies. Management believes that the presentation of these measures and the identification of unusual, non-recurring, or non-cash items enhance an investor's understanding of the underlying trends in the Company's business and provide for better comparability between periods in different years.Adjusted EBITDA excludes depreciation, accretion, and amortization expense as these amounts can vary substantially from company to company within the Company's industry depending upon accounting methods and book values of assets, capital structures, and the method by which the assets were acquired. Adjusted EBITDA also excludes acquisition-related costs, certain other non-operating costs, loss on asset disposal, our obligations for the payment of income taxes, interest expense or other obligations such as capital expenditures, and an adjustment for noncontrolling interest. Adjusted Net Income represents net income computed in accordance with GAAP, before amortization expense, loss on disposal of assets, stock-based compensation expense and certain other expense (income) and acquisition-related costs, and using an assumed 35% tax rate, with certain adjustments for noncontrolling interests. Adjusted Net Income per diluted share is calculated by dividing Adjusted Net Income by average weighted diluted shares outstanding calculated in accordance with GAAP. Free Cash Flow is defined as cash provided by operating activities less payments for capital expenditures, including those financed through direct debt but excluding acquisitions. The measure of Free Cash Flow does not take into consideration certain other non-discretionary cash requirements such as, for example, mandatory principal payments on portions of the Company's long-term debt.