Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Utility plant in service	$ 4,423,228	$ 4,382,534
Less accumulated depreciation	2,118,343	2,043,540
Utility plant in service - net	2,304,885	2,338,994
Construction work in progress	171,033	70,169
Spare parts inventory	16,160	15,445
Property held for future use	1,002	1,002
Utility plant - net	2,493,080	2,425,610
OTHER ASSETS:
Nonutility property - at cost, less accumulated depreciation	529	533
Other investments	5,705	5,333
Other assets - net	6,234	5,866
CURRENT ASSETS:
Cash and cash equivalents	77,561	18,487
Accounts receivable and unbilled revenue (less allowance for doubtful accounts of $1,955 and $2,047, respectively)	140,665	141,508
Fuel inventories - at average cost	48,750	45,236
Materials and supplies - at average cost	59,924	57,256
Deferred tax asset - current	11,023	10,809
Regulatory assets	3,700	4,906
Prepayments and other current assets	27,929	21,135
Total current assets	369,552	299,337
DEFERRED DEBITS:
Regulatory assets	506,052	523,839
Miscellaneous	32,689	30,695
Total deferred debits	538,741	554,534
TOTAL	3,407,607	3,285,347
CAPITALIZATION AND LIABILITIES
Paid in capital	61,415	11,811
Accumulated deficit	(2,505)	(15,030)
Total common shareholder's equity (deficit)	58,910	(3,219)
Cumulative preferred stock of subsidiary	59,784	59,784
Long-term debt	1,821,498	1,651,120
Total capitalization	1,940,192	1,707,685
CURRENT LIABILITIES:
Short-term and current portion of long-term debt (Note 5)	50,000	160,000
Accounts payable	80,887	76,343
Accrued expenses	23,388	24,310
Accrued real estate and personal property taxes	24,322	19,405
Regulatory liabilities	24,035	10,475
Accrued interest	46,421	31,979
Customer deposits	25,872	24,796
Other current liabilities	13,060	11,210
Total current liabilities	287,985	358,518
DEFERRED CREDITS AND OTHER LONG-TERM LIABILITIES:
Regulatory liabilities	586,546	570,344
Accumulated deferred income taxes - net	335,786	341,859
Non-current income tax liability	6,426	6,138
Unamortized investment tax credit	7,036	8,162
Accrued pension and other postretirement benefits	224,276	274,017
Miscellaneous	19,360	18,624
Total deferred credits and other long-term liabilities	1,179,430	1,219,144
COMMITMENTS AND CONTINGENCIES (Note 7)
TOTAL	$ 3,407,607	$ 3,285,347