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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment    
Regulated energy $ 622,895 $ 585,429
Unregulated energy 72,877 70,218
Other 20,660 20,067
Total property, plant and equipment 716,432 675,714
Less: Accumulated depreciation and amortization (165,646) (155,378)
Plus: Construction work in progress 42,421 21,445
Net property, plant and equipment 593,207 541,781
Current Assets    
Cash and cash equivalents 2,210 3,361
Accounts receivable (less allowance for uncollectible accounts of $1,125 and $826, respectively) 66,933 53,787
Accrued revenue 7,188 11,688
Propane inventory, at average cost 6,375 7,612
Other inventory, at average cost 3,361 5,841
Regulatory assets 1,084 2,736
Storage gas prepayments 3,262 3,716
Income taxes receivable 0 4,703
Deferred income taxes 919 791
Prepaid expenses 3,798 6,020
Mark-to-market energy assets 248 210
Other current assets 165 132
Total current assets 95,543 100,597
Deferred Charges and Other Assets    
Goodwill 4,716 4,090
Other intangible assets, net 3,175 2,798
Investments, at fair value 4,917 4,168
Regulatory assets 75,331 77,408
Receivables and other deferred charges 2,769 2,904
Total deferred charges and other assets 90,908 91,368
Total Assets 779,658 733,746
Stockholders' equity    
Common stock, par value $0.4867 per share (authorized 25,000,000 shares) 4,684 4,671
Additional paid-in capital 151,391 150,750
Retained earnings 118,187 106,239
Accumulated other comprehensive loss (4,958) (5,062)
Deferred compensation obligation 1,096 982
Treasury stock (1,096) (982)
Total stockholders' equity 269,304 256,598
Long-term debt, net of current maturities 107,674 101,907
Total capitalization 376,978 358,505
Current Liabilities    
Current portion of long-term debt 7,996 8,196
Short-term borrowing 75,491 61,199
Accounts payable 45,789 41,992
Customer deposits and refunds 25,532 29,271
Accrued interest 1,121 1,437
Dividends payable 3,706 3,502
Income taxes payable 1,896 0
Accrued compensation 5,437 7,435
Regulatory liabilities 5,329 1,577
Mark-to-market energy liabilities 74 331
Other accrued liabilities 9,126 7,226
Total current liabilities 181,497 162,166
Deferred Credits and Other Liabilities    
Deferred income taxes 131,199 125,205
Deferred investment tax credits 93 113
Regulatory liabilities 6,947 5,454
Environmental liabilities 8,905 9,114
Other pension and benefit costs 33,491 33,535
Accrued asset removal cost-Regulatory liability 38,923 38,096
Other liabilities 1,625 1,558
Total deferred credits and other liabilities 221,183 213,075
Other commitments and contingencies (Note 5 and 6)      
Total Capitalization and Liabilities $ 779,658 $ 733,746