Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment
Regulated energy	$ 635,859	$ 585,429
Unregulated energy	73,816	70,218
Other	21,048	20,067
Total property, plant and equipment	730,723	675,714
Less: Accumulated depreciation and amortization	(171,060)	(155,378)
Plus: Construction work in progress	50,256	21,445
Net property, plant and equipment	609,919	541,781
Current Assets
Cash and cash equivalents	1,792	3,361
Accounts receivable (less allowance for uncollectible accounts of $1,215 and $826, respectively)	60,578	53,787
Accrued revenue	7,948	11,688
Propane inventory, at average cost	7,383	7,612
Other inventory, at average cost	3,452	5,841
Regulatory assets	2,063	2,736
Storage gas prepayments	5,309	3,716
Income taxes receivable	724	4,703
Deferred income taxes	837	791
Prepaid expenses	7,357	6,020
Mark-to-market energy assets	379	210
Other current assets	160	132
Total current assets	97,982	100,597
Deferred Charges and Other Assets
Goodwill	4,716	4,090
Other intangible assets, net	3,075	2,798
Investments, at fair value	2,788	4,168
Regulatory assets	76,179	77,408
Receivables and other deferred charges	2,898	2,904
Total deferred charges and other assets	89,656	91,368
Total Assets	797,557	733,746
Stockholders' equity
Common stock, par value $0.4867 per share (authorized 25,000,000 shares)	4,685	4,671
Additional paid-in capital	151,676	150,750
Retained earnings	118,330	106,239
Accumulated other comprehensive loss	(4,903)	(5,062)
Deferred compensation obligation	1,110	982
Treasury stock	(1,110)	(982)
Total stockholders' equity	269,788	256,598
Long-term debt, net of current maturities	107,344	101,907
Total capitalization	377,132	358,505
Current Liabilities
Current portion of long-term debt	8,234	8,196
Short-term borrowing	91,297	61,199
Accounts payable	41,013	41,992
Customer deposits and refunds	26,943	29,271
Accrued interest	2,581	1,437
Dividends payable	3,706	3,502
Accrued compensation	6,467	7,435
Regulatory liabilities	4,397	1,577
Mark-to-market energy liabilities	124	331
Other accrued liabilities	10,252	7,226
Total current liabilities	195,014	162,166
Deferred Credits and Other Liabilities
Deferred income taxes	135,305	125,205
Deferred investment tax credits	84	113
Regulatory liabilities	6,808	5,454
Environmental liabilities	8,838	9,114
Other pension and benefit costs	33,118	33,535
Accrued asset removal cost-Regulatory liability	39,156	38,096
Other liabilities	2,102	1,558
Total deferred credits and other liabilities	225,411	213,075
Other commitments and contingencies (Note 5 and 6)
Total Capitalization and Liabilities	$ 797,557	$ 733,746