CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Utility plant:
Utility plant	$ 4,612,350	$ 4,536,272
Less accumulated depreciation and amortization	(1,508,913)	(1,477,402)
Net utility plant	3,103,437	3,058,870
Current assets:
Cash and cash equivalents	52,286	62,100
Restricted cash	34,153	22,925
Receivables:
Customers, net	46,539	55,079
Regulatory balancing accounts	50,335	66,826
Other, net	20,576	20,932
Unbilled revenue, net	29,546	33,140
Materials and supplies	13,287	12,564
Taxes, prepaid expenses, and other assets	22,561	21,969
Total current assets	269,283	295,535
Other assets:
Regulatory assets	293,263	283,620
Goodwill	36,814	36,814
Other assets	184,065	175,913
Total other assets	514,142	496,347
TOTAL ASSETS	3,886,862	3,850,752
Capitalization:
Common stock, $0.01 par value; 136,000 shares authorized, 55,991 and 55,598 outstanding in 2023 and 2022, respectively	560	556
Additional paid-in capital	777,605	760,336
Retained earnings	520,031	556,698
Noncontrolling interests	4,792	4,804
Total equity	1,302,988	1,322,394
Long-term debt, net	1,052,337	1,052,487
Total capitalization	2,355,325	2,374,881
Current liabilities:
Current maturities of long-term debt, net	3,300	3,310
Short-term borrowings	130,000	70,000
Accounts payable	120,198	140,986
Regulatory balancing accounts	17,272	12,240
Accrued interest	16,790	6,490
Accrued expenses and other liabilities	62,744	61,624
Total current liabilities	350,304	294,650
Deferred income taxes	326,401	330,251
Pension	79,245	78,443
Regulatory liabilities and other	288,511	287,294
Advances for construction	199,305	199,832
Contributions in aid of construction	287,771	285,401
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 3,886,862	$ 3,850,752