Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Utility plant:
Land	$ 45,047	$ 45,672
Depreciable plant and equipment	3,899,629	3,645,770
Construction work in progress	222,713	171,414
Intangible assets	29,955	27,567
Total utility plant	4,197,344	3,890,423
Less accumulated depreciation and amortization	(1,350,482)	(1,239,865)
Net utility plant	2,846,862	2,650,558
Current assets:
Cash and cash equivalents	78,380	44,555
Receivables:
Customers, net	60,785	44,025
Regulatory balancing accounts	78,597	96,241
Other, net	18,452	20,331
Unbilled revenue, net	32,760	34,069
Materials and supplies at weighted average cost	9,511	8,831
Taxes, prepaid expenses, and other assets	21,973	17,964
Total current assets	300,458	266,016
Other assets:
Regulatory assets	285,692	325,376
Goodwill	36,814	31,842
Other	153,445	120,456
Total other assets	475,951	477,674
TOTAL ASSETS	3,623,271	3,394,248
Capitalization:
Common stock, $0.01 par value; 68,000 shares authorized, 53,716 and 50,334 outstanding in 2021 and 2020, respectively	537	503
Additional paid-in capital	651,121	448,632
Retained earnings	525,936	472,209
Noncontrolling interests	5,386	0
Total equity	1,182,980	921,344
Long-term debt, net	1,055,794	781,100
Total capitalization	2,238,774	1,702,444
Current liabilities:
Current maturities of long-term debt, net	5,192	5,127
Short-term borrowings	35,000	370,000
Accounts payable	144,369	131,725
Regulatory balancing accounts	17,547	34,636
Accrued other taxes	5,379	4,477
Accrued interest	6,542	6,178
Other accrued liabilities	42,547	36,563
Total current liabilities	256,576	588,706
Deferred income taxes	298,945	276,032
Regulatory liabilities	180,428	180,718
Pension	92,287	115,581
Total refunds	198,086	195,625
Contributions in aid of construction	285,665	268,050
Other long-term liabilities	72,510	67,092
Commitments and contingencies (Note 15)
TOTAL CAPITALIZATION AND LIABILITIES	$ 3,623,271	$ 3,394,248