CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Utility plant:
Utility plant	$ 2,621,322	$ 2,506,946
Less accumulated depreciation and amortization	(836,245)	(805,178)
Net utility plant	1,785,077	1,701,768
Current assets:
Cash and cash equivalents	30,826	8,837
Receivables:
Customers	36,635	31,512
Regulatory balancing accounts	26,453	35,052
Other	11,901	14,760
Unbilled revenue	33,535	23,181
Materials and supplies at weighted average cost	6,393	6,339
Taxes, prepaid expenses, and other assets	13,257	7,897
Total current assets	159,000	127,578
Other assets:
Regulatory assets	363,321	361,893
Goodwill	2,615	2,615
Other assets	48,110	47,399
Total other assets	414,046	411,907
TOTAL ASSETS	2,358,123	2,241,253
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 47,971 and 47,875 outstanding in 2016 and 2015, respectively	480	479
Additional paid-in capital	333,561	333,135
Retained earnings	302,719	308,541
Total common stockholders’ equity	636,760	642,155
Long-term debt, less current maturities	555,787	508,002
Total capitalization	1,192,547	1,150,157
Current liabilities:
Current maturities of long-term debt	6,133	6,043
Short-term borrowings	75,100	33,615
Accounts payable	77,604	66,380
Regulatory balancing accounts	2,702	2,227
Accrued interest	5,820	5,088
Accrued expenses and other liabilities	34,654	34,545
Total current liabilities	202,013	147,898
Unamortized investment tax credits	1,872	1,872
Deferred income taxes	271,407	264,897
Pension and postretirement benefits other than pensions	238,823	236,266
Regulatory liabilities and other	92,141	82,414
Advances for construction	180,429	180,172
Contributions in aid of construction	178,891	177,577
Commitments and contingencies (Note 10)	0	0
TOTAL CAPITALIZATION AND LIABILITIES	$ 2,358,123	$ 2,241,253