Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Current assets:
Cash, cash equivalents and restricted cash	$ 94,438	$ 76,975	$ 50,780
Receivables, net	926,804	942,782	934,173
Current regulatory assets	217,822	172,492	193,162
Inventories	69,736	87,392	60,154
Prepayments and other current assets	88,239	84,082	60,502
Retained shares in Knife River	0	0	246,063
Total current assets	1,397,039	1,363,723	1,544,834
Noncurrent assets:
Property, plant and equipment	7,560,455	7,341,116	7,083,229
Less accumulated depreciation and amortization	2,295,499	2,220,206	2,160,439
Net property, plant and equipment	5,264,956	5,120,910	4,922,790
Goodwill	488,960	488,960	488,960
Other intangible assets, net	960	2,004	3,049
Regulatory assets	351,334	447,099	345,185
Investments	123,391	124,235	139,569
Operating lease right-of-use assets	83,189	74,363	74,553
Other	250,507	211,865	165,910
Total noncurrent assets	6,563,297	6,469,436	6,140,016
Total assets	7,960,336	7,833,159	7,684,850
Current liabilities:
Short-term borrowings	0	95,000	345,000
Long-term debt due within one year	193,608	61,319	1,319
Accounts payable	442,568	475,215	399,339
Taxes payable	63,029	58,110	60,284
Dividends payable	25,029	25,461	45,310
Accrued compensation	63,927	85,512	66,555
Operating lease liabilities due within one year	24,597	22,884	22,666
Regulatory liabilities due within one year	158,535	70,761	48,057
Other accrued liabilities	178,566	181,471	143,235
Total current liabilities	1,149,859	1,075,733	1,131,765
Noncurrent liabilities:
Long-term debt	2,207,009	2,236,904	2,246,103
Deferred income taxes	454,826	458,548	515,661
Asset retirement obligations	393,743	384,371	380,058
Regulatory liabilities	461,366	521,050	455,877
Operating lease liabilities	58,826	51,645	52,328
Other	216,903	199,675	196,865
Total noncurrent liabilities	3,792,673	3,852,193	3,846,892
Commitments and contingencies
Stockholders' equity:
Common stock Authorized - 500,000,000 shares, $1.00 par value Shares issued - 203,888,237 at June 30, 2024, 203,638,373 at June 30, 2023 and 203,689,090 at December 31, 2023	203,888	203,689	203,638
Other paid-in capital	1,468,483	1,466,235	1,460,735
Retained earnings	1,363,604	1,253,693	1,059,517
Accumulated other comprehensive loss	(18,171)	(18,384)	(17,697)
Total stockholders' equity	3,017,804	2,905,233	2,706,193
Total liabilities and stockholders' equity	$ 7,960,336	$ 7,833,159	$ 7,684,850