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DEBT (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Debt Instrument [Line Items] |
Schedule of debt | At December 31, 2023 and 2022, debt consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Long-term debt |  | ​ |  |  | ​ |
Senior Unsecured Notes due through 2045, interest at 2.8% to 4.0% (net of debt issuance costs of $1,270 and $1,585 at December 31, 2023 and 2022, respectively) | ​ | $ | 702,766 | ​ | $ | 703,124
Term Loan due through 2025, interest at SOFR plus a 0.85% margin, swapped $150,000 to a fixed interest rate of 3.55% plus a 0.85% margin | ​ | ​ | 400,000 | ​ | ​ | 400,000
Other borrowings due through 2030, interest up to 7.97% | ​ |  | 9 | ​ |  | 18,311
​ | ​ |  | 1,102,775 | ​ |  | 1,121,435
Less current portion | ​ |  | 4 | ​ |  | 11,039
Long-term debt, less current portion | ​ |  | 1,102,771 | ​ |  | 1,110,396
Short-term debt | ​ |  | ​ | ​ |  |
Amounts due banks, weighted average interest at 47.7% in 2023 and 4.0% in 2022 | ​ |  | 2,435 | ​ |  | 82,444
Current portion long-term debt | ​ |  | 4 | ​ |  | 11,039
Total short-term debt | ​ |  | 2,439 | ​ |  | 93,483
Total debt | ​ | $ | 1,105,210 | ​ | $ | 1,203,879
Senior Notes [Member] |
Debt Instrument [Line Items] |
Schedule of debt | The maturity and interest rates of the 2015 Notes and 2016 Notes are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amount |  | Maturity Date |  | Interest Rate |
2015 Notes |  | ​ |  |  |  |  |  | ​
Series A | ​ | $ | 100,000 | ​ | August 20, 2025 |  | 3.15 | %
Series B | ​ |  | 100,000 | ​ | August 20, 2030 |  | 3.35 | %
Series C | ​ |  | 50,000 | ​ | April 1, 2035 |  | 3.61 | %
Series D | ​ |  | 100,000 | ​ | April 1, 2045 |  | 4.02 | %
2016 Notes | ​ |  |  | ​ |  |  |  | ​
Series A | ​ | $ | 100,000 | ​ | October 20, 2028 |  | 2.75 | %
Series B | ​ |  | 100,000 | ​ | October 20, 2033 |  | 3.03 | %
Series C | ​ |  | 100,000 | ​ | October 20, 2037 |  | 3.27 | %
Series D | ​ |  | 50,000 | ​ | October 20, 2041 |  | 3.52 | %

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