6. Credit facilities

On March 9, 2015, we entered into an amendment to our unsecured credit agreement (the “Credit Agreement”). The Credit Agreement, as amended, provides for a revolving line of credit up to $400 million that may be used for revolving loans, swingline loans (subject to a sublimit of $5 million), and to request letters of credit, subject to a sublimit of $30 million. The line of credit is available for general corporate purposes, including working capital, capital expenditures and acquisitions. The arrangement will terminate on March 9, 2020, at which time all outstanding borrowings must be repaid.

We had no borrowings under the Credit Agreement at March 31, 2015.

At March 31, 2015, our only indebtedness under the Credit Agreement was three letters of credit totaling $4.7 million. Each of these letters of credit may be called by customers in the event that the Company defaults under the terms of a contract, the probability of which we believe is remote. In addition, two letters of credit totaling $3.0 million, secured with restricted cash balances, are held with another financial institution to cover similar obligations.

The Credit Agreement requires us to comply with certain financial covenants and other covenants including a maximum total leverage ratio and a minimum fixed charge coverage ratio. We were in compliance with all covenants as of March 31, 2015. Our obligations under the Credit Agreement are guaranteed by material domestic subsidiaries of the Company. The Credit Facility is currently unsecured. In the event that our total leverage ratio, as defined in the credit agreement, exceeds 2.5 to 1, the Credit Agreement will become secured by the assets of the parent company and certain of its subsidiaries. At March 31, 2015, our total leverage ratio was negligible.

The Credit Agreement provides for an annual commitment fee payable on funds not borrowed or utilized for letters of credit. This charge is based upon our leverage and varies between 0.15% and 0.3%. Borrowings under the Credit Agreement bear interest at our choice at either (a) a Base Rate plus a margin that varies between 0.0% and 0.75% per year, (b) a Eurocurrency Rate plus an applicable margin that varies between 1.0% and 1.75% per year or (c) an Index Rate plus an applicable margin which varies between 1.0% and 1.75% per year. The Base Rate, Eurocurrency Rate and Index Rate are defined by the Credit Agreement.

On April 1, 2015, in connection with the Acentia acquisition, we borrowed $225 million under our Credit Agreement and issued an additional letter of credit for $0.6 million. We currently estimate that our leverage ratio will be below 1.0:1.0 after this borrowing.