CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income	$ 77,220	$ 96,457
Non-cash items included in net income:
Depreciation and amortization	188,961	169,239
Deferred income tax provision and investment tax credits	(19,494)	18,645
Power and natural gas cost deferrals, net	(20,675)	(40,178)
Amortization of debt expense	1,506	2,068
Stock-based compensation expense	6,787	3,173
Equity-related AFUDC	(5,117)	(5,280)
Pension and other postretirement benefit expense	15,460	21,925
Other regulatory assets and liabilities and deferred debits and credits	3,585	2,597
Change in decoupling regulatory deferral	28,455	12,602
Realized and unrealized gain on assets and investments	(13,783)	(15,883)
Other	4,364	1,370
Contributions to defined benefit pension plan	(42,000)	(42,000)
Cash paid for settlement of interest rate swap agreements	(17,035)	(17,568)
Cash received for settlement of interest rate swap agreements		324
Changes in certain current assets and liabilities:
Accounts and notes receivable	32,347	24,521
Materials and supplies, fuel stock and stored natural gas	(38,714)	(19,753)
Collateral posted for derivative instruments	(29,362)	(9,944)
Income taxes receivable	5,991	10,663
Other current assets	4,074	7,902
Accounts payable	(22,145)	(889)
Other current liabilities	49,987	8,925
Net cash provided by operating activities	210,412	228,916
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(331,309)	(322,808)
Equity and property investments	(9,061)	(12,621)
Proceeds from sale of investments	1,000	8,306
Other	(941)	193
Net cash used in investing activities	(340,311)	(326,930)
Financing Activities:
Net increase (decrease) in short-term borrowings	(16,000)	66,000
Proceeds from issuance of long-term debt	399,856	70,000
Maturity of long-term debt and finance leases	(252,314)	(2,223)
Issuance of common stock, net of issuance costs	92,966	61,345
Cash dividends paid	(96,278)	(88,204)
Other	(6,136)	(3,876)
Net cash provided by financing activities	122,094	103,042
Net increase (decrease) in cash and cash equivalents	(7,805)	5,028
Cash and cash equivalents at beginning of period	22,168	14,196
Cash and cash equivalents at end of period	$ 14,363	$ 19,224