Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net Income	$ 21,109us-gaap_NetIncomeLoss	$ 17,681us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,975	6,635
Depreciation and accretion included in other costs	1,689	1,783
Deferred income taxes, net	(496)us-gaap_DeferredIncomeTaxExpenseBenefit	(231)us-gaap_DeferredIncomeTaxExpenseBenefit
Realized gain on commodity contracts/sales of assets/investments	(840)us-gaap_GainLossOnDispositionOfAssets	(8)us-gaap_GainLossOnDispositionOfAssets
Unrealized loss on investments/commodity contracts	21	31
Employee benefits	300	162
Share-based compensation	537us-gaap_ShareBasedCompensation	638us-gaap_ShareBasedCompensation
Other, net	4us-gaap_OtherNoncashIncomeExpense	(1)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:
Accounts receivable and accrued revenue	(8,014)	(3,647)
Propane inventory, storage gas and other inventory	5,337us-gaap_IncreaseDecreaseInInventories	8,243us-gaap_IncreaseDecreaseInInventories
Increase (Decrease) in Regulatory Assets and Liabilities	(16,185)	(200)
Prepaid expenses and other current assets	2,500	2,185
Accounts payable and other accrued liabilities	2,376	4,821
Income taxes receivable	21,753	11,565
Customer deposits and refunds	(2,890)	(1,735)
Accrued compensation	(5,262)	(3,505)
Other assets and liabilities, net	2,753	1,246
Net cash provided by operating activities	64,037	46,063
Investing Activities
Property, plant and equipment expenditures	(27,508)	(18,528)
Proceeds from sales of assets	198	29
Environmental expenditures	(49)	(26)
Net cash used in investing activities	(27,359)	(18,525)
Financing Activities
Common stock dividends	(3,573)us-gaap_PaymentsOfDividendsCommonStock	(3,369)us-gaap_PaymentsOfDividendsCommonStock
Purchase of stock for Dividend Reinvestment Plan	27us-gaap_ProceedsFromRepurchaseOfEquity	(341)us-gaap_ProceedsFromRepurchaseOfEquity
Change in cash overdrafts due to outstanding checks	(2,191)	(501)
Net borrowing (repayment) under line of credit agreements	(19,269)	(21,696)
Repayment of long-term debt	(76)us-gaap_RepaymentsOfLongTermDebt	(196)us-gaap_RepaymentsOfLongTermDebt
Net cash used in financing activities	(25,082)	(26,103)
Net Decrease in Cash and Cash Equivalents	11,596	1,435
Cash and Cash Equivalents-Beginning of Period	4,574	3,356
Cash and Cash Equivalents-End of Period	$ 16,170	$ 4,791

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+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Name:	us-gaap_UnrealizedGainLossOnCommodityContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration