Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income	$ 117,380	$ 121,024
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	61,643	60,463
Deferred financing cost amortization	2,410	2,475
Stock compensation	1,784	3,638
Deferred income taxes	14,858	14,462
Employee benefit plans	3,021	1,173
Other adjustments, net	(2,816)	5,337
Change in certain operating assets and liabilities:
Materials, supplies and fuel	76,122	34,995
Accounts receivable and other current assets	28,729	(71,241)
Accounts payable and other current liabilities	(127,233)	(8,422)
Regulatory assets	154,666	98,528
Other operating activities, net	(1,819)	1,689
Net cash provided by operating activities	328,745	264,121
Investing activities:
Property, plant and equipment additions	(119,105)	(136,779)
Other investing activities	17,600	(1,065)
Net cash (used in) investing activities	(101,505)	(137,844)
Financing activities:
Dividends paid on common stock	(41,362)	(38,533)
Common stock issued	27,383	3,791
Net borrowings (payments) of Revolving Credit Facility and CP Program	(535,600)	(78,700)
Long-term debt - issuance	350,000	0
Distributions to non-controlling interests	(4,494)	(4,420)
Other financing activities	(5,022)	(878)
Net cash (used in) financing activities	(209,095)	(118,740)
Net change in cash, restricted cash and cash equivalents	18,145	7,537
Cash, restricted cash and cash equivalents beginning of period	26,985	13,810
Cash, restricted cash and cash equivalents end of period	45,130	21,347
Supplemental cash flow information:
Interest (net of amounts capitalized)	(27,569)	(23,605)
Income taxes	49	0
Accrued property, plant and equipment purchases at March 31,	$ 42,102	$ 39,559