CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Utility plant:
Utility plant	$ 2,560,787	$ 2,506,946
Less accumulated depreciation and amortization	(821,108)	(805,178)
Net utility plant	1,739,679	1,701,768
Current assets:
Cash and cash equivalents	30,878	8,837
Receivables:
Customers	31,397	31,512
Regulatory balancing accounts	31,554	35,052
Other	12,741	14,760
Unbilled revenue	25,522	23,181
Materials and supplies at weighted average cost	6,321	6,339
Taxes, prepaid expense, and other assets	10,108	7,897
Total current assets	148,521	127,578
Other assets:
Regulatory assets	361,249	361,893
Goodwill	2,615	2,615
Other assets	47,741	47,399
Total other assets	411,605	411,907
TOTAL ASSETS	2,299,805	2,241,253
Capitalization:
Common stock, $.01 par value; 68,000 shares authorized, 47,974 and 47,875 outstanding in 2016 and 2015, respectively	480	479
Additional paid-in capital	333,002	333,135
Retained earnings	299,485	308,541
Total common stockholders’ equity	632,967	642,155
Long-term debt, less current maturities	557,849	508,002
Total capitalization	1,190,816	1,150,157
Current liabilities:
Current maturities of long-term debt	6,113	6,043
Short-term borrowings	34,500	33,615
Accounts payable	65,354	66,380
Regulatory balancing accounts	1,075	2,227
Accrued interest	11,611	5,088
Accrued expenses and other liabilities	39,490	34,545
Total current liabilities	158,143	147,898
Unamortized investment tax credits	1,872	1,872
Deferred income taxes	264,153	264,897
Pension and postretirement benefits other than pensions	239,164	236,266
Regulatory liabilities and other	88,018	82,414
Advances for construction	180,210	180,172
Contributions in aid of construction	177,429	177,577
Commitments and contingencies (Note 10)	0	0
TOTAL CAPITALIZATION AND LIABILITIES	$ 2,299,805	$ 2,241,253