CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Utility plant:
Utility plant	$ 1,895,384	$ 1,843,766
Less accumulated depreciation and amortization	(567,788)	(549,469)
Net utility plant	1,327,596	1,294,297
Current assets:
Cash and cash equivalents	32,882	42,277
Receivables:
Customers	30,620	25,813
Regulatory balancing accounts	13,085	14,784
Other	6,148	5,386
Unbilled revenue	21,545	13,925
Materials and supplies at average cost	6,064	6,058
Taxes, prepaid expenses and other assets	21,267	17,967
Total current assets	131,611	126,210
Other assets:
Regulatory assets	245,956	229,577
Goodwill	2,615	2,615
Other assets	37,375	39,367
Total other assets	285,946	271,559
Total assets	1,745,153	1,692,066
Capitalization:
Common stock, $.01 par value-68,000 shares authorized, 41,752 and 41,667 outstanding in 2011 and 2010, respectively	418	417
Additional paid-in capital	217,937	217,308
Retained earnings	219,885	217,801
Total common stockholders' equity	438,240	435,526
Long-term debt, less current maturities	477,968	479,181
Total capitalization	916,208	914,707
Current liabilities:
Current maturities of long-term debt	2,377	2,380
Short-term borrowings	32,760	23,750
Accounts payable	51,647	39,505
Regulatory balancing accounts	2,297	3,025
Accrued interest	4,689	4,651
Accrued expenses and other liabilities	37,856	34,037
Total current liabilities	131,626	107,348
Unamortized investment tax credits	2,244	2,244
Deferred income taxes, net	120,046	107,084
Pension and postretirement benefits other than pensions	162,439	155,224
Regulatory and other liabilities	70,726	82,204
Advances for construction	187,277	186,899
Contributions in aid of construction	154,587	136,356
Total capitalization and liabilities	$ 1,745,153	$ 1,692,066