Condensed Consolidated Balance Sheets - Entity [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment
Regulated energy	$ 795,331	$ 766,855
Unregulated energy	139,174	84,773
Other	19,051	18,497
Total property, plant and equipment	953,556	870,125
Less: Accumulated depreciation and amortization	(205,030)	(193,369)
Plus: Construction work in progress	41,923	13,006
Net property, plant and equipment	790,449	689,762
Current Assets
Cash and cash equivalents	2,104	4,574
Accounts receivable (less allowance for uncollectible accounts of $1,146 and $1,120, respectively)	42,270	53,300
Accrued revenue	8,091	13,617
Propane inventory, at average cost	4,151	7,250
Other inventory, at average cost	4,305	3,699
Regulatory assets	7,587	8,967
Storage gas prepayments	2,498	4,258
Income taxes receivable	2,518	18,806
Deferred income taxes	128	0
Prepaid expenses	4,223	6,652
Mark-to-market energy assets	358	1,055
Other current assets	285	195
Total current assets	78,518	122,373
Deferred Charges and Other Assets
Goodwill	16,048	4,952
Other intangible assets, net	2,415	2,404
Investments, at fair value	3,665	3,678
Regulatory assets	77,657	78,136
Receivables and other deferred charges	1,884	3,164
Total deferred charges and other assets	101,669	92,334
Total Assets	970,636	904,469
Stockholders' equity
Common stock, par value $0.4867 per share (authorized 25,000,000 shares)	7,419	7,100
Additional paid-in capital	187,903	156,581
Retained earnings	161,333	142,317
Accumulated other comprehensive loss	(5,479)	(5,676)
Deferred compensation obligation	1,843	1,258
Treasury stock	(1,843)	(1,258)
Total stockholders' equity	351,176	300,322
Long-term debt, net of current maturities	156,247	158,486
Total capitalization	507,423	458,808
Current Liabilities
Current portion of long-term debt	9,127	9,109
Short-term borrowing	94,713	88,231
Accounts payable	38,173	44,610
Customer deposits and refunds	21,449	25,197
Accrued interest	1,256	1,352
Dividends payable	4,382	3,939
Deferred Tax Liabilities, Net, Current	0	832
Accrued compensation	6,500	10,076
Regulatory liabilities	15,205	3,268
Mark-to-market energy liabilities	47	1,018
Other accrued liabilities	8,756	6,603
Total current liabilities	199,608	194,235
Deferred Credits and Other Liabilities
Deferred income taxes	173,821	160,232
Regulatory liabilities	43,307	43,419
Environmental liabilities	9,043	8,923
Other pension and benefit costs	33,614	35,027
Deferred investment credits and Other liabilities	3,820	3,825
Total deferred credits and other liabilities	$ 263,605	$ 251,426
Other commitments and contingencies (Note 6)
Total Capitalization and Liabilities	$ 970,636	$ 904,469