CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Utility plant:
Utility plant	$ 3,835,194	$ 3,550,485
Less accumulated depreciation and amortization	(1,238,880)	(1,144,115)
Net utility plant	2,596,314	2,406,370
Current assets:
Cash and cash equivalents	113,312	42,653
Receivables:
Customers, net	53,397	32,058
Regulatory balancing accounts	54,415	38,225
Other, net	15,056	14,187
Unbilled revenue, net	46,247	34,879
Materials and supplies at weighted average cost	8,611	7,745
Taxes, prepaid expenses, and other assets	14,726	14,965
Total current assets	305,764	184,712
Other assets:
Regulatory assets	484,435	433,322
Goodwill	30,349	2,615
Other assets	89,572	84,289
Total other assets	604,356	520,226
TOTAL ASSETS	3,506,434	3,111,308
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 49,840 and 48,532 outstanding in 2020 and 2019, respectively	498	485
Additional paid-in capital	422,391	362,275
Retained earnings	467,303	417,146
Total common stockholders’ equity	890,192	779,906
Long-term debt, net	785,055	786,754
Total capitalization	1,675,247	1,566,660
Current liabilities:
Current maturities of long-term debt, net	21,883	21,868
Short-term borrowings	375,100	175,100
Accounts payable	127,158	108,463
Regulatory balancing accounts	11,003	4,462
Accrued interest	14,233	5,810
Accrued expenses and other liabilities	54,446	43,018
Total current liabilities	603,823	358,721
Deferred income taxes	245,456	222,590
Pension and postretirement benefits other than pensions	261,081	258,907
Regulatory liabilities and other	257,054	271,831
Advances for construction	196,853	191,062
Contributions in aid of construction	266,920	241,537
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 3,506,434	$ 3,111,308