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Debt | 12 Months Ended
--- | ---
Dec. 31, 2021
Debt Disclosure [Abstract] |
Debt | Debt A summary of debt follows (dollars in thousands):
| Average Interest Rate |  |  |  |  |  |
| December 31, 2021 |  | Maturity |  | 2021 |  | 2020
Private placement unsecured fixed-rate notes |  |  |  |  |  |  |
Series B | 5.01% |  | March 2023 |  | 75,000 |  |  | 75,000 |
Series D | 5.35% |  | July 2026 |  | 75,000 |  |  | 75,000 |
Unsecured revolving credit facility | N/A |  | March 2026 |  | — |  |  | — |
Unsecured revolving credit facility - CNH | 3.52% |  | N/A |  | 39,222 |  |  | 7,668 |
Notes payable to banks | 1.11% |  | 2022 |  | 4,267 |  |  | 14,515 |
Total debt |  |  |  |  | $ | 193,489 |  |  | $ | 172,183 |
The estimated fair value of the fixed interest rate private placement debt was $165 million on December 31, 2021 and $170 million on December 25, 2020. 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. 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 provisions for the replacement of the LIBOR-based rate as that rate is phased out in the lending market. 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 January 29, 2020, the Company entered into a master note agreement with a sole lender that expires on January 29, 2023. The note agreement sets forth certain terms on which the Company may issue, and affiliates of the lender may purchase, up to $200 million of the Company’s senior notes. Interest on the senior notes will be determined at the time of issuance, at a fixed or LIBOR-based floating rate at the option of the Company, provided that the maximum aggregate principal amount of notes bearing interest at a floating rate may not exceed $100 million. Fixed rate notes issued under the agreement will mature no longer than 12 years from date of issuance and variable rate notes will mature no longer than 10 years from issuance. Under terms of the 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 31, 2021, the Company had $595 million in lines of credit, including the $550 million in committed credit facilities described above and $45 million with foreign banks. The unused portion of committed credit lines was $525 million as of December 31, 2021. In addition, the Company has unused, uncommitted lines of credit with foreign banks totaling $28 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 31, 2021. Annual maturities of debt are as follows (in thousands):
| 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Thereafter
Maturities of debt | $ | 118,489 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 75,000 |  |  | $ | — |
Interest paid on debt was $9.8 million in 2021, $11.3 million in 2020 and $13.5 million in 2019.
Subsequent Events | Subsequent Event. In January 2022, we repaid $75 million of our Series B private placement note in addition to a $3.5 million prepayment fee, which will be recognized as interest expense in the first quarter of 2022.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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