Long-Term Debt and Loan Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term Debt	$ 111,400	$ 78,000
Less unamortized deferred financing fees	61	424
Long-term Debt, net of deferred financing costs	111,339	77,576
Less current portion long-term debt	0	39,994
Long-term debt	111,339	37,582
Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt	73,400
4.67% Senior Unsecured Notes due January 15, 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt		40,000
5.25% Senior Unsecured Notes due January 15, 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt	11,000	11,000
5.30% Senior Unsecured Notes due January 15, 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt	15,000	15,000
5.45% Senior Unsecured Notes due January 15, 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 12,000	$ 12,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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