Our senior, unsecured notes and revolving credit agreement each contain cross-default provisions which permit the acceleration of our indebtedness to them if we default on other indebtedness that results in, or permits, the acceleration of such other indebtedness.
The revolving credit facility requires maintenance of a financial leverage ratio, measured as of the last day of each of our fiscal quarters, of 3.50:1 or less. The leverage ratio is the ratio of: (a) interest-bearing debt minus unrestricted cash in excess of $50 million (but not exceeding $500 million); to (b) adjusted EBITDA. The debt agreements provide a modification of the definition of “EBITDA” to add-back any non-cash stock-based compensation in any trailing twelve month period and allow for an adjustment to EBITDA, subject to certain limitations, for non-cash charges or gains that are non-recurring in nature. The leverage ratio is permitted to increase from 3.50:1 to 3:75:1 for the four consecutive fiscal quarters after certain material acquisitions.
The amended and restated revolving credit agreement also contains customary affirmative and negative covenants or credit facilities of this type, including, among others, limitations on us and our subsidiaries with respect to indebtedness, liens, mergers and acquisitions, investments, dispositions of assets, restricted payments, transactions with affiliates and prepayments of indebtedness. The amended and restated revolving credit agreement also provides for acceleration of the obligations thereunder and exercise of other enforcement remedies upon the occurrence of customary events of default (subject to customary grace periods, as applicable).
At September 24, 2022, we were in compliance with all covenants related to these debt agreements.
The calculation of Adjusted EBITDA-last four quarters and the Leverage ratio are presented in the tables below in Selected Financial Measures.
Cash Uses
Our principal cash requirements include working capital, capital expenditures, payments of principal and interest on our debt, payments of taxes, contributions to pension plan, and, if market conditions warrant, occasional investments in, or acquisitions of, business ventures. In addition, we regularly evaluate our ability to pay dividends or repurchase stock, all consistent with the terms of our debt agreements.
Our businesses are cyclical, but we have diversity in our markets, from a product, customer and a geographical standpoint. We have demonstrated the ability to effectively manage through business cycles and maintain liquidity. We have consistently generated operating cash flows in excess of our capital expenditures. Based on our available credit facilities, recent issuance of senior unsecured notes and our history of positive operational cash flows, we believe that we have adequate liquidity to meet our needs.
We have cash balances of $166.2 million at September 24, 2022, approximately $136.6 million is held in our non-U.S. subsidiaries. If we distributed our foreign cash balances certain taxes would be applicable. At September 24, 2022, we have a liability for foreign withholding taxes and U.S. state income taxes of $3.8 million and $0.7 million, respectively.
Cash Flows
The following table includes a summary of our cash flow information for the thirty-nine weeks ended September 24, 2022 and September 25, 2021:
| | | | | | |
Dollars in thousands | | 2022 | | 2021 |
Cash flow data: | | | | | | |
Net cash flows from operating activities | | $ | 183,726 | | $ | 61,829 |
Net cash flows from investing activities | | | (106,446) | | | (389,463) |
Net cash flows from financing activities | | | (79,143) | | | 101,016 |
Working Capital and Operating Cash Flows- Net working capital was $981.9 million at September 24, 2022, as compared to $946.9 million at December 25, 2021. The increase in net working capital in 2022 is attributed to an increase in inventory due to higher average steel costs, an increase in accounts receivables, partially offset by an increase in accounts payable. Cash flow provided by operations was $183.7 million in the first three quarters of 2022, as compared with $61.8 million in the first three quarters of 2021. The increase in operating cash flows in the first three quarters of 2022, as compared