Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net Income	$ 36,092us-gaap_NetIncomeLoss	$ 32,787us-gaap_NetIncomeLoss	$ 28,863us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net operating cash:
Asset Impairment Charges	6,881us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Depreciation and amortization	26,316	23,965	22,510
Depreciation and accretion included in other costs	6,577	6,123	5,547
Deferred income taxes, net	22,235us-gaap_DeferredIncomeTaxExpenseBenefit	14,860us-gaap_DeferredIncomeTaxExpenseBenefit	13,881us-gaap_DeferredIncomeTaxExpenseBenefit
Gain (Loss) on Disposition of Assets	7,293us-gaap_GainLossOnDispositionOfAssets1	854us-gaap_GainLossOnDispositionOfAssets1	(5)us-gaap_GainLossOnDispositionOfAssets1
Unrealized Gain (Loss) on Commodity Contracts	(501)	706	112
Employee benefits and compensation	684	1,119	1,199
Share-based compensation	1,958us-gaap_ShareBasedCompensation	1,631us-gaap_ShareBasedCompensation	1,419us-gaap_ShareBasedCompensation
Other, net	3us-gaap_OtherNoncashIncomeExpense	(28)us-gaap_OtherNoncashIncomeExpense	(27)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:
Accounts receivable and accrued revenue	20,683	(21,244)	21,549
Propane inventory, storage gas and other inventory	4,177us-gaap_IncreaseDecreaseInInventories	(4,492)us-gaap_IncreaseDecreaseInInventories	603us-gaap_IncreaseDecreaseInInventories
Increase (Decrease) in Regulatory Assets and Liabilities	11,014	(2,328)	4,968
Prepaid expenses and other current assets	(699)	(1,064)	(713)
Accounts payable and other accrued liabilities	(8,047)	18,824	(19,936)
Income taxes receivable	(15,936)	2,311	2,223
Customer deposits and refunds	(927)	(3,362)	(1,647)
Accrued compensation	37	837	437
Other liabilities	(2,944)	(104)	(4,192)
Net cash provided by operating activities	79,284	72,931	66,641
Investing Activities
Property, plant and equipment expenditures	(97,164)	(97,120)	(72,776)
Increase (Decrease) in Intangible Assets, Current	14	0	0
Proceeds from sale of assets	10,797	199	2,279
Proceeds from sale of investments	0	2,300	630
Acquisitions	0	(20,201)	(124)
Environmental expenditures	(233)	41	(607)
Net cash used by investing activities	(86,586)	(114,781)	(70,598)
Financing Activities
Common stock dividends	(13,887)us-gaap_PaymentsOfDividendsCommonStock	(13,081)us-gaap_PaymentsOfDividendsCommonStock	(12,335)us-gaap_PaymentsOfDividendsCommonStock
Purchase of stock for Dividend Reinvestment Plan	(165)us-gaap_ProceedsFromRepurchaseOfEquity	(1,342)us-gaap_ProceedsFromRepurchaseOfEquity	(1,273)us-gaap_ProceedsFromRepurchaseOfEquity
Change in cash overdrafts due to outstanding checks	(921)	(1,666)	597
Net borrowing (repayment) under line of credit agreements	(16,513)	46,133	25,894
Proceeds from issuance of long-term debt	49,975	26,766	0
Repayment of long-term debt and capital lease obligation	(9,969)us-gaap_RepaymentsOfLongTermDebt	(14,957)us-gaap_RepaymentsOfLongTermDebt	(8,202)us-gaap_RepaymentsOfLongTermDebt
Other	0us-gaap_PaymentsOfStockIssuanceCosts	(8)us-gaap_PaymentsOfStockIssuanceCosts	0us-gaap_PaymentsOfStockIssuanceCosts
Net cash provided by financing activities	8,520	41,845	4,681
Net Increase (Decrease) in Cash and Cash Equivalents	1,218	(5)	724
Cash and Cash Equivalents — Beginning of Period	3,356	3,361	2,637
Cash and Cash Equivalents — End of Period	$ 4,574	$ 3,356	$ 3,361

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

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Period Type:	duration

- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The net cash inflow or outflow resulting from the entity's share transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell mineral resources, energy, and agricultural products at some future point held at each balance sheet date, that was included in earnings for the period.

+ References

+ Details

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