CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Utility plant:
Utility plant	$ 2,460,829	$ 2,342,471
Less accumulated depreciation and amortization	(797,264)	(752,040)
Net utility plant	1,663,565	1,590,431
Current assets:
Cash and cash equivalents	50,825	19,587
Receivables:
Customers	41,574	25,803
Regulatory balancing accounts	38,112	53,199
Other	14,369	14,136
Unbilled revenue	31,276	23,740
Materials and supplies at average cost	6,087	6,041
Taxes, prepaid expense, and other assets	8,823	11,618
Total current assets	191,066	154,124
Other assets:
Regulatory assets	398,535	390,331
Goodwill	2,615	2,615
Other assets	50,739	49,850
Total other assets	451,889	442,796
Total assets	2,306,520	2,187,351
Capitalization:
Common stock, $.01 par value; 68,000 shares authorized, 47,877 and 47,806 outstanding in 2015 and 2014, respectively	479	478
Additional paid-in capital	332,290	330,558
Retained earnings	308,083	295,590
Total common stockholders’ equity	640,852	626,626
Long-term debt, less current maturities	416,447	419,233
Total capitalization	1,057,299	1,045,859
Current liabilities:
Current maturities of long-term debt	6,565	6,607
Short-term borrowings	136,615	79,115
Accounts payable	77,261	59,395
Regulatory balancing accounts	1,870	6,126
Accrued interest	9,678	4,194
Accrued expenses and other liabilities	68,781	62,269
Total current liabilities	300,770	217,706
Unamortized investment tax credits	1,947	2,032
Deferred income taxes, net	236,443	214,842
Pension and postretirement benefits other than pensions	276,525	270,865
Regulatory liabilities and other	76,799	83,279
Advances for construction	180,805	182,284
Contributions in aid of construction	175,932	170,484
Commitments and contingencies (Note 10)	0	0
Total capitalization and liabilities	$ 2,306,520	$ 2,187,351