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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operating Activities    
Net Income $ 15,787 $ 17,267
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,646 9,958
Depreciation and accretion included in other costs 2,686 2,473
Deferred income taxes, net 8,562 12,449
Loss on sale of assets 33 94
Unrealized loss on commodity contracts 232 30
Unrealized gain on investments (502) (131)
Employee benefits 309 571
Share-based compensation 697 705
Other, net (14) (18)
Changes in assets and liabilities:    
Sale (purchase) of investments (232) 258
Accounts receivable and accrued revenue 37,103 14,017
Propane inventory, storage gas and other inventory 5,416 3,315
Regulatory assets (24) 601
Prepaid expenses and other current assets 2,084 1,792
Accounts payable and other accrued liabilities (18,359) (11)
Income taxes receivable 920 (2,666)
Accrued interest (215) (241)
Customer deposits and refunds (927) (1,182)
Accrued compensation (1,853) (2,234)
Regulatory liabilities (2,859) 2,887
Other liabilities 23 155
Net cash provided by operating activities 60,513 60,089
Investing Activities    
Property, plant and equipment expenditures (34,140) (21,236)
Proceeds from sales of assets 2,249 344
Purchase of investments (124) (200)
Environmental expenditures (194) (326)
Net cash used in investing activities (32,209) (21,418)
Financing Activities    
Common stock dividends (5,987) (5,685)
Purchase of stock for Dividend Reinvestment Plan (619) (609)
Change in cash overdrafts due to outstanding checks (2,144) (3,193)
Net repayment under line of credit agreements (19,010) (27,417)
Other short-term borrowing   (29,100)
Proceeds from issuance of long-term debt   29,000
Repayment of long-term debt (1,444) (1,482)
Net cash used in financing activities (29,204) (38,486)
Net Increase (Decrease) in Cash and Cash Equivalents (900) 185
Cash and Cash Equivalents-Beginning of Period 2,637 1,643
Cash and Cash Equivalents-End of Period $ 1,737 $ 1,828