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DEBT (Tables)

12 Months Ended

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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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.

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