Long-Term Debt and Loan Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt	$ 78,000	$ 78,000
Less unamortized deferred financing fees	524	824
Long-term Debt, net of deferred financing costs	77,476	77,176
Less current portion long-term debt	39,975	0
Long-term debt	37,501	77,176
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.

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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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