CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities:
Net income	$ 65,877	$ 140,897
Non-cash items included in net income:
Depreciation and amortization	115,752	104,757
Deferred income tax provision and investment tax credits	(8,400)	5,577
Power and natural gas cost amortizations (deferrals), net	1,815	(47,716)
Amortization of debt expense	1,365	1,338
Amortization of investment in exchange power		1,225
Stock-based compensation expense	2,826	7,009
Equity-related AFUDC	(3,271)	(3,253)
Pension and other postretirement benefit expense	16,481	18,040
Other regulatory assets and liabilities and deferred debits and credits	4,391	1,122
Change in decoupling regulatory deferral	(454)	(5,444)
Gain on sale of METALfx (before payment of transaction costs)		(6,477)
Gain on sale of investments	(3,231)
Other	9,043	(3,904)
Contributions to defined benefit pension plan	(14,600)	(14,600)
Changes in certain current assets and liabilities:
Accounts and notes receivable	43,701	47,771
Materials and supplies, fuel stock and stored natural gas	(751)	(7,225)
Collateral posted for derivative instruments	(7,209)	47,352
Income taxes receivable	9,106	517
Other current assets	(5,704)	(9,300)
Accounts payable	(29,860)	(19,393)
Other current liabilities	3,011	(5,622)
Net cash provided by operating activities	199,888	252,671
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(189,480)	(199,988)
Issuance of notes receivable by subsidiaries	(4,343)	(900)
Equity and property investments	(2,097)	(6,624)
Proceeds from sale of METALfx (net of cash sold)		16,407
Proceeds from sale of investments	5,144
Other	(988)	1,072
Net cash used in investing activities	(191,764)	(190,033)
Financing Activities:
Net increase (decrease) in short-term borrowings	135,200	(21,000)
Maturity of long-term debt and finance leases	(1,431)	(1,330)
Issuance of common stock, net of issuance costs	23,890	14,929
Cash dividends paid	(54,708)	(51,153)
Other	(4,577)	(1,509)
Net cash provided by (used in) financing activities	98,374	(60,063)
Net increase in cash and cash equivalents	106,498	2,575
Cash and cash equivalents at beginning of period	9,896	14,656
Cash and cash equivalents at end of period	$ 116,394	$ 17,231