CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 2,820	$ 5,811
Restricted cash	15,942	11,285
Accounts receivable, net	198,671	168,229
Inventories	80,614	61,010
Regulatory assets	115,541	44,973
Prepaid expenses and other	24,207	17,372
Total current assets	437,795	308,680
Property, plant, and equipment, net	5,247,232	4,952,935
Goodwill	357,586	357,586
Regulatory assets	690,686	701,444
Other noncurrent assets	47,144	68,804
Total Assets	6,780,443	6,389,449
Current Liabilities:
Current maturities of finance leases	2,875	2,668
Short-term borrowings	0	100,000
Accounts payable	115,237	100,388
Accrued expenses	233,351	207,514
Regulatory liabilities	28,179	55,853
Total current liabilities	379,642	466,423
Long-term finance leases	11,897	14,771
Long-term debt	2,541,478	2,315,261
Deferred income taxes	499,634	471,777
Noncurrent regulatory liabilities	638,760	631,419
Other noncurrent liabilities	369,319	410,703
Total Liabilities	4,440,730	4,310,354
Commitments and Contingencies (Note 18)
Common Stock, Value, Issued	$ 576	$ 541
Common stock, par or stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	57,606,252	54,144,775
Common Stock, shares outstanding	54,060,608	50,587,163
Preferred stock, par or stated value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred Stock, shares issued	0	0
Shareholders' Equity:
Treasury stock at cost	$ (98,248)	$ (98,075)
Paid-in capital	1,716,227	1,513,787
Retained earnings	728,468	670,111
Accumulated other comprehensive loss	(7,310)	(7,269)
Total Shareholders' Equity	2,339,713	2,079,095
Total Liabilities and Shareholders' Equity	$ 6,780,443	$ 6,389,449