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Debt
 12 Months Ended
Dec. 30, 2022
Debt Disclosure [Abstract]  
Debt Debt
A summary of debt follows (dollars in thousands):
Average Interest Rate
December 30, 2022Maturity20222021
Private placement unsecured fixed-rate notes
Series B5.01%January 2022— 75,000 
Series D5.35%July 202675,000 75,000 
Unsecured revolving credit facilityN/AMarch 2026— — 
Unsecured revolving credit facility - offshore renminbi denominated3.34%N/A14,327 39,222 
Notes payable to banks2.80%20236,647 4,267 
Total debt$95,974 $193,489 

The estimated fair value of the fixed interest rate private placement debt was $75 million on December 30, 2022 and $165 million on December 31, 2021. The fair value of variable rate borrowings approximates carrying value. The Company uses significant other observable inputs to estimate fair value (level 2 of the fair value hierarchy) based on the present value of future cash flows and rates that would be available for issuance of debt with similar terms and remaining maturities.

On March 25, 2021, the Company entered into an amended and restated credit agreement that amends, supersedes and restates in its entirety the Company's prior credit agreement with U.S. Bank National Association, as administrative agent (the “Agent”) and a lender, and the other lenders that are parties thereto. The amended and restated credit agreement extends the maturity of the Company’s $500 million unsecured revolving credit facility from December 15, 2021 to March 25, 2026; includes a $250 million accordion feature; and provides mechanisms for two further one-year extensions of the maturity, subject to the consent of the extending banks.

Borrowings under the amended and restated credit agreement may be denominated in U.S. dollars or certain other currencies. Outstanding loans in currencies other than U.S. dollars cannot exceed $200 million in the aggregate. The amended and restated credit agreement contains customary provisions for the replacement of the LIBOR-based rate as that rate is expected to be phased out by July 1, 2023. Currently, loans denominated in U.S. dollars may bear interest, at the Company’s option, at either a base rate or a LIBOR-based rate. Loans denominated in currencies other than U.S. dollars will bear interest at a LIBOR-based rate. The base rate is an annual rate equal to a margin ranging from 0.00% to 0.75%, depending on the Company’s cash flow leverage ratio, plus the highest of (i) the rate of interest from time to time announced by the Agent as its prime rate, (ii) the federal funds effective rate plus 0.50%, or (iii) one-month LIBOR plus 1.50%. In general, LIBOR-based loans bear interest at a rate per annum equal to LIBOR, plus a margin ranging from 1.00% to 1.75%, depending on the Company’s cash flow leverage ratio. In addition to paying interest on the outstanding loans, the Company is required to pay a facility fee on the unused amount of the loan commitments at a rate per annum ranging from 0.125% to 0.25%, depending on the Company’s cash flow leverage ratio.

The amended and restated credit agreement contains customary representations, warranties, covenants and events of default, including but not limited to covenants restricting the Company’s and its subsidiaries’ ability to (i) merge or
consolidate with another entity, (ii) sell, transfer, lease or convey their assets, (iii) make any material change in the nature of the core business of the Company, (iv) make certain investments, or (v) incur secured indebtedness. The amended and restated credit agreement also requires the Company to maintain a cash flow leverage ratio of not more than 3.50 to 1.00 (unless a significant acquisition has been consummated, in which case, not more than 4.00 to 1.00 during the four fiscal quarter period beginning with the quarter in which such acquisition occurs) and an interest coverage ratio of not less than 3.00 to 1.00 (unless a significant acquisition has been consummated, in which case, not less than 2.50 to 1.00 during the four fiscal quarter period beginning with the quarter in which such acquisition occurs). A change in control of the Company will constitute an event of default under the amended and restated credit agreement.

The Company maintains a revolving credit agreement with a sole lender that provides up to $50 million of committed credit, available for general corporate purposes, working capital needs, share repurchases and acquisitions. Under the terms of the agreement, loans may be denominated in U.S. dollars or Chinese renminbi (offshore). Loans denominated in U.S. dollars bear interest, at the Company’s option, at either a base rate or a LIBOR-based rate. Loans denominated in Chinese renminbi (offshore) bear interest at a LIBOR-based rate based on the Chinese offshore rate. Other terms of this revolving credit agreement are substantially similar to those of the Company’s amended and restated credit agreement that expires in March 2026.
On December 16, 2022, the Company entered into an amendment to its master note agreement that extends the period in which the Company may issue, and affiliates of the lender may purchase, the Company’s senior notes from January 29, 2023 to December 16, 2027. The amendment also increases the maximum aggregate principal amount of senior notes the Company may issue under the master note agreement from $200 million to $250 million, although the maximum aggregate amount of senior notes bearing interest at a floating rate that may be outstanding at any one time will continue to be $100 million. The amendment also extends the maturity and average life of each senior note bearing interest at a fixed rate that may be issued under the master note agreement from no more than 12 years after the date of issuance to no more than 15 years after the date of issuance, and includes customary provisions for the replacement of LIBOR with SOFR and customary benchmark replacement provisions with respect to senior notes bearing interest at a floating rate. All other material items of the master note agreement remain unchanged. Under the terms of the master note agreement, the Company is required to maintain certain financial ratios as to cash flow leverage and interest coverage similar to the requirements of its other debt agreements.

On December 30, 2022, the Company had $591 million in lines of credit, including the $550 million in committed credit facilities described above and $41 million with foreign banks. The unused portion of committed credit lines was $545 million as of December 30, 2022. In addition, the Company has unused, uncommitted lines of credit with foreign banks totaling $17 million. Borrowing rates under these credit lines vary with the prime rate, rates on domestic certificates of deposit and the London Interbank market. The Company pays facility fees at an annual rate of up to 0.15 on certain of these lines. No compensating balances are required.

Various debt agreements require the Company to maintain certain financial ratios as to cash flow leverage and interest coverage. The Company is in compliance with all financial covenants of its debt agreements as of December 30, 2022.

Annual maturities of debt are as follows (in thousands):
20232024202520262027Thereafter
Maturities of debt$20,974 $— $— $75,000 $— $— 

Interest paid on debt was $10.0 million in 2022, $9.8 million in 2021 and $11.3 million in 2020.

In January 2022, we repaid $75 million of our Series B private placement note in addition to a $3.5 million prepayment fee, which was recognized as interest expense.