Long-Term Debt and Loan Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt	$ 145,862	$ 152,632
Less unamortized deferred financing fees	1,499	1,596
Long-term Debt, net of deferred financing costs	144,363	151,036
Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt	67,862	74,632
4.67% Senior Unsecured Notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	40,000	40,000
5.25% Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt	11,000	11,000
5.30% Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt	15,000	15,000
5.45% Senior Unsecured Notes due 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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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