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DEBT (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Instrument [Line Items] |
Schedule of debt | At December 31, 2020 and 2019, debt consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Long-term debt |  | ​ |  |  | ​ |
Senior Unsecured Notes due through 2045, interest at 2.8% to 4.0% (net of debt issuance costs of $1,178 and $1,282 at December 31, 2020 and 2019, respectively), swapped $50,000 to variable interest rates of 2.4% to 2.6% in 2019 | ​ | $ | 704,886 | ​ | $ | 701,681
Other borrowings due through 2023, interest up to 2.0% | ​ |  | 10,681 | ​ |  | 10,733
​ | ​ |  | 715,567 | ​ |  | 712,414
Less current portion | ​ |  | 111 | ​ |  | 112
Long-term debt, less current portion | ​ |  | 715,456 | ​ |  | 712,302
Short-term debt | ​ |  | ​ | ​ |  |
Amounts due banks, weighted average interest at 17.9% in 2020 and 4.9% in 2019 | ​ |  | 2,623 | ​ |  | 34,857
Current portion long-term debt | ​ |  | 111 | ​ |  | 112
Total short-term debt | ​ |  | 2,734 | ​ |  | 34,969
Total debt | ​ | $ | 718,190 | ​ | $ | 747,271
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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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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