CONDENSED CONSOLIDATED BALANCE SHEETS Unaudited - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Utility plant:
Utility plant	$ 3,025,611	$ 2,970,179
Less accumulated depreciation and amortization	(942,573)	(922,214)
Net utility plant	2,083,038	2,047,965
Current assets:
Cash and cash equivalents	34,702	94,776
Receivables:
Customers	28,161	32,451
Regulatory balancing accounts	34,119	36,783
Other	21,216	16,464
Unbilled revenue	28,132	29,756
Materials and supplies at weighted average cost	6,478	6,463
Taxes, prepaid expenses, and other assets	12,977	11,180
Total current assets	165,785	227,873
Other assets:
Regulatory assets	405,041	401,147
Goodwill	2,615	2,615
Other assets	60,028	60,775
Total other assets	467,684	464,537
TOTAL ASSETS	2,716,507	2,740,375
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 48,074 and 48,012 outstanding in 2018 and 2017, respectively	481	480
Additional paid-in capital	335,625	336,229
Retained earnings	345,205	356,753
Total common stockholders’ equity	681,311	693,462
Long-term debt, less current maturities	515,670	515,793
Total capitalization	1,196,981	1,209,255
Current liabilities:
Current maturities of long-term debt	5,924	15,920
Short-term borrowings	275,100	275,100
Accounts payable	73,556	93,955
Regulatory balancing accounts	56,206	59,303
Accrued interest	12,342	6,122
Accrued expenses and other liabilities	41,189	40,559
Total current liabilities	464,317	490,959
Unamortized investment tax credits	1,724	1,724
Deferred income taxes	192,313	192,946
Pension and postretirement benefits other than pensions	256,520	252,141
Regulatory liabilities and other	232,587	224,127
Advances for construction	184,479	182,502
Contributions in aid of construction	187,586	186,721
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 2,716,507	$ 2,740,375