CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES:
Net Income	$ 59,110	$ 63,071
Items not affecting cash:
Depreciation and depletion	48,905	46,975
Amortization of debt issuance costs, discount and deferred hedge gain	1,270	1,303
Stock-based compensation costs	2,757	3,223
Equity portion of allowance for funds used during construction	(3,116)	(1,985)
Gain on disposition of assets	(1)	(57)
Deferred income taxes	(6,558)	(2,706)
Changes in current assets and liabilities:
Accounts receivable	24,936	5,230
Inventories	10,005	4,183
Other current assets	1,181	(455)
Accounts payable	(3,432)	(16,591)
Accrued expenses and other	46,119	63,169
Regulatory assets	14,961	(54,195)
Regulatory liabilities	(1,003)	(23,228)
Other noncurrent assets	7,153	(1,682)
Other noncurrent liabilities	(6,621)	(20,656)
Cash Provided by Operating Activities	195,666	65,599
INVESTING ACTIVITIES:
Property, plant, and equipment additions	(115,502)	(77,854)
Investment in equity securities	(567)	0
Cash Used in Investing Activities	(116,069)	(77,854)
FINANCING ACTIVITIES:
Dividends on common stock	(33,901)	(31,124)
Issuance of long-term debt, net	0	99,915
Line of credit (repayments) borrowings, net	(33,000)	49,000
Repayments of short-term borrowings	0	(100,000)
Cash (Used in) Provided by Financing Activities	(67,461)	17,049
Increase in Cash, Cash Equivalents, and Restricted Cash	12,136	4,794
Cash, Cash Equivalents, and Restricted Cash, beginning of period	18,762	17,096
Cash, Cash Equivalents, and Restricted Cash, end of period	30,898	21,890
Cash paid during the period for:
Interest	14,152	13,765
Significant non-cash transactions:
Capital expenditures included in accounts payable	17,156	18,089
Proceeds from (Payments for) Other Financing Activities	$ (560)	$ (742)