CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Utility plant:
Utility plant	$ 4,261,451	$ 4,197,344
Less accumulated depreciation and amortization	(1,374,036)	(1,350,482)
Net utility plant	2,887,415	2,846,862
Current assets:
Cash and cash equivalents	68,379	78,380
Receivables:
Customers, net	50,276	60,785
Regulatory balancing accounts	68,043	78,597
Other, net	18,065	18,452
Unbilled revenue, net	34,953	32,760
Materials and supplies at weighted average cost	10,526	9,511
Taxes, prepaid expenses, and other assets	22,232	21,973
Total current assets	272,474	300,458
Other assets:
Regulatory assets	291,577	285,692
Goodwill	36,814	36,814
Other assets	150,961	153,445
Total other assets	479,352	475,951
TOTAL ASSETS	3,639,241	3,623,271
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 53,773 and 53,716 outstanding in 2022 and 2021, respectively	538	537
Additional paid-in capital	650,499	651,121
Retained earnings	513,593	525,936
Noncontrolling interests	5,248	5,386
Total equity	1,169,878	1,182,980
Long-term debt, net	1,055,638	1,055,794
Total capitalization	2,225,516	2,238,774
Current liabilities:
Current maturities of long-term debt, net	5,205	5,192
Short-term borrowings	50,000	35,000
Accounts payable	140,832	144,369
Regulatory balancing accounts	12,015	17,547
Accrued interest	17,116	6,542
Accrued expenses and other liabilities	56,649	47,926
Total current liabilities	281,817	256,576
Deferred income taxes	298,690	298,945
Pension	93,544	92,287
Regulatory liabilities and other	253,647	252,938
Advances for construction	198,200	198,086
Contributions in aid of construction	287,827	285,665
Commitments and contingencies (Note 10)
TOTAL CAPITALIZATION AND LIABILITIES	$ 3,639,241	$ 3,623,271