Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Dec. 31, 2023
Property, Plant and Equipment
Regulated Energy	$ 2,470,135		$ 2,418,494
Unregulated Energy	416,833		410,807
Other businesses and eliminations	31,606		30,310
Total property, plant and equipment	2,918,574		2,859,611
Less: Accumulated depreciation and amortization	(530,832)		(516,429)
Property, Plant and Equipment, Net	2,511,080		2,456,374
Current Assets
Cash and cash equivalents	1,695		4,904
Trade and other receivables	68,300		71,786
Accounts Receivable, Allowance for Credit Loss, Current	(2,450)		(2,699)
Accounts Receivable, before Allowance for Credit Loss, Current	70,750		74,485
Accrued revenue	28,308		32,597
Propane inventory, at average cost	8,367		9,313
Other inventory, at average cost	19,638		19,912
Regulatory assets	24,289		19,506
Storage gas prepayments	1,147		4,695
Income taxes receivable	0		3,829
Prepaid expenses	13,681		15,407
Derivative assets, at fair value	1,012		1,027
Other current assets	3,228		2,723
Total current assets	169,665		185,699
Deferred Charges and Other Assets
Goodwill	507,573		508,174
Other intangible assets, net	16,414		16,865
Investments, at fair value	13,221		12,282
Operating Lease, Right-of-Use Asset	11,719		12,426
Regulatory assets	86,039		96,396
Receivables and other deferred charges	16,047		16,448
Total deferred charges and other assets	651,139		662,631
Total Assets	3,331,884		3,304,704
Stockholders’ equity
Preferred stock, par value $0.01 per share (authorized 2,000 shares), no shares issued and outstanding	0		0
Common stock, par value $0.4867 per share (authorized 50,000 shares)	10,838		10,823
Additional paid-in capital	750,162		749,356
Retained earnings	521,689		488,663
Accumulated other comprehensive income (loss)	(1,786)		(2,738)
Deferred compensation obligation	9,562		9,050
Treasury stock	(9,562)		(9,050)
Total stockholders’ equity	1,280,903	[1]	1,246,104
Total capitalization	2,466,069		2,433,179
Current Liabilities
Less: current maturities	18,511		18,505
Short-term borrowing	170,355		179,853
Accounts payable	63,058		77,481
Customer deposits and refunds	43,682		46,427
Accrued interest	17,148		7,020
Dividends payable	13,138		13,119
Accrued compensation	7,066		16,544
Regulatory liabilities	21,328		13,719
Derivative liabilities, at fair value	31		354
Other accrued liabilities	16,520		13,362
Total current liabilities	371,655		386,384
Deferred Credits and Other Liabilities
Deferred income taxes	271,335		259,082
Regulatory liabilities	193,030		195,279
Environmental liabilities	2,546		2,607
Other pension and benefit costs	16,010		15,330
Operating Lease, Liability, Noncurrent	9,832		10,550
Deferred investment tax credits and other liabilities	1,364		1,366
Total deferred credits and other liabilities	494,160		485,141
Environmental and other commitments and contingencies (Notes 5 and 6)
Total Capitalization and Liabilities	3,331,884		3,304,704
Other businesses and eliminations	31,606		30,310
Property, Plant and Equipment, Gross	2,918,574		2,859,611
Construction Work in Progress	123,338		113,192
Property, Plant and Equipment, Net	2,511,080		2,456,374
Trade and other receivables	68,300		71,786
Income taxes receivable	0		3,829
Other current assets	3,228		2,723
Assets, Current	169,665		185,699
Receivables and other deferred charges	16,047		16,448
Deferred Charges And Other Assets	651,139		662,631
Total identifiable assets	3,331,884		3,304,704
Regulated Energy	2,470,135		2,418,494
Unregulated Energy	416,833		410,807
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	530,832		516,429
Cash and cash equivalents	1,695		4,904
Accounts Receivable, before Allowance for Credit Loss, Current	70,750		74,485
Allowance for uncollectible accounts	2,450		2,699
Accrued revenue	28,308		32,597
Propane inventory, at average cost	8,367		9,313
Other inventory, at average cost	19,638		19,912
Regulatory assets	24,289		19,506
Storage gas prepayments	1,147		4,695
Prepaid expenses	13,681		15,407
Derivative assets, at fair value	1,012		1,027
Goodwill	507,573		508,174
Other intangible assets, net	16,414		16,865
Investments, at fair value	13,221		12,282
Operating Lease, Right-of-Use Asset	11,719		12,426
Regulatory assets	86,039		96,396
Preferred stock, par value $0.01 per share (authorized 2,000 shares), no shares issued and outstanding	0		0
Stockholders' Equity Attributable to Parent	1,280,903	[1]	1,246,104
Capitalization, Long-term Debt and Equity	2,466,069		2,433,179
Accounts payable	63,058		77,481
Other accrued liabilities	16,520		13,362
Liabilities, Current	371,655		386,384
Regulatory liabilities	193,030		195,279
Operating Lease, Liability, Noncurrent	9,832		10,550
Deferred investment tax credits and other liabilities	1,364		1,366
Deferred Credits and Other Liabilities	494,160		485,141
Environmental and other commitments and contingencies (Notes 5 and 6)
Liabilities and Equity	3,331,884		3,304,704
Common stock, par value $0.4867 per share (authorized 50,000 shares)	10,838		10,823
Additional paid-in capital	750,162		749,356
Retained earnings	521,689		488,663
Accumulated other comprehensive income (loss)	(1,786)		(2,738)
Deferred compensation obligation	9,562		9,050
Treasury Stock, Value	9,562		9,050
Long-term Debt and Capital Lease Obligations, Net of Current Maturities	1,185,166		1,187,075
Less: current maturities	18,511		18,505
Short-term borrowing	170,355		179,853
Customer deposits and refunds	43,682		46,427
Accrued interest	17,148		7,020
Dividends payable	13,138		13,119
Accrued compensation	7,066		16,544
Regulatory liabilities	21,328		13,719
Taxes Payable, Current	818		0
Energy Marketing Contract Liabilities, Current	31		354
Deferred income taxes	271,335		259,082
Environmental liabilities	2,546		2,607
Other pension and benefit costs	16,010		15,330
Energy Marketing Contracts Assets, Noncurrent	126		40
Energy Marketing Contract Liabilities, Noncurrent	43		$ 927
Accrued compensation	$ (9,480)

[1] 2.0 million shares of preferred stock at $0.01 par value have been authorized. No shares have been issued or are outstanding; accordingly, no information has been included in the Condensed Consolidated Statements of Stockholders’ Equity.