CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 8,577	$ 5,811
Restricted cash	15,642	11,285
Accounts receivable, net	139,328	168,229
Inventories	84,410	61,010
Regulatory assets	113,507	44,973
Prepaid expenses and other	25,814	17,372
Total current assets	387,278	308,680
Property, plant, and equipment, net	5,152,455	4,952,935
Goodwill	357,586	357,586
Regulatory assets	726,015	701,444
Other noncurrent assets	43,296	68,804
Total Assets	6,666,630	6,389,449
Current Liabilities:
Current maturities of finance leases	2,821	2,668
Short-term borrowings	0	100,000
Accounts payable	89,737	100,388
Accrued expenses	292,535	207,514
Regulatory liabilities	22,912	55,853
Total current liabilities	408,005	466,423
Long-term finance leases	12,642	14,771
Long-term debt	2,463,088	2,315,261
Deferred income taxes	484,161	471,777
Noncurrent regulatory liabilities	635,923	631,419
Other noncurrent liabilities	416,278	410,703
Total Liabilities	4,420,097	4,310,354
Commitments and Contingencies (Note 10)
Shareholders' Equity:
Common Stock, Value, Issued	562	541
Treasury stock at cost	(98,424)	(98,075)
Paid-in capital	1,641,390	1,513,787
Retained earnings	710,467	670,111
Accumulated other comprehensive loss	(7,462)	(7,269)
Total Shareholders' Equity	2,246,533	2,079,095
Total Liabilities and Shareholders' Equity	$ 6,666,630	$ 6,389,449
Preferred Stock, Shares Issued	0
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Shares Authorized	200,000,000
Common Stock, Shares, Issued	56,157,660
Common Stock, Shares, Outstanding	52,605,730
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized	50,000,000
Preferred Stock, Shares Outstanding	0