Long-Term Debt and Loan Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 78,000	$ 78,000
Less unamortized deferred financing fees	824	1,210
Long-term Debt, net of deferred financing costs	77,176	76,790
4.67% Senior Unsecured Notes due January 15, 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	40,000	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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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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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