Long-Term Debt and Loan Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt	$ 219,985	$ 193,512
Less unamortized deferred financing fees	1,514	1,631
Long-term Debt, net of deferred financing costs	218,471	191,881
Loan Agreement
Debt Instrument [Line Items]
Long-term Debt	119,985	93,512
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	29,000	29,000
5.45% Senior Unsecured Notes due 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 20,000	$ 20,000

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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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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