Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 31,608	$ 9,777
Restricted cash and equivalents	4,105	3,881
Accounts receivable, net	170,980	255,805
Materials, supplies and fuel	105,987	117,172
Derivative assets, current	1,581	342
Income tax receivable, net	20,118	16,446
Regulatory assets, current	51,745	43,282
Other current assets	27,981	26,479
Total current assets	414,105	473,184
Investments	15,438	21,929
Property, plant and equipment	6,954,274	6,784,679
Less: accumulated depreciation and depletion	(1,251,075)	(1,281,493)
Total property, plant and equipment, net	5,703,199	5,503,186
Other assets:
Goodwill	1,299,454	1,299,454
Intangible assets, net	12,536	13,266
Regulatory assets, non-current	220,567	228,062
Other assets, non-current	24,633	19,376
Total other assets, non-current	1,557,190	1,560,158
TOTAL ASSETS	7,689,932	7,558,457
Current liabilities:
Accounts payable	118,942	193,523
Accrued liabilities	201,667	226,767
Derivative liabilities, current	621	2,254
Regulatory liabilities, current	59,428	33,507
Notes payable	0	349,500
Current maturities of long-term debt	4,307	5,743
Total current liabilities	384,965	811,294
Long-term debt, net of current maturities	3,532,887	3,140,096
Deferred credits and other liabilities:
Deferred income tax liabilities, net	388,962	360,719
Regulatory liabilities, non-current	506,393	503,145
Benefit plan liabilities	142,580	154,472
Other deferred credits and other liabilities	119,649	124,662
Total deferred credits and other liabilities	1,157,584	1,142,998
Commitments and contingencies (See Notes 7, 9, 12, 13)
Equity:
Common stock $1 par value; 100,000,000 shares authorized; issued 62,772,996 and 61,480,658 shares, respectively	62,773	61,481
Additional paid-in capital	1,654,563	1,552,788
Retained earnings	826,269	778,776
Treasury stock, at cost – 26,399 and 3,956 shares, respectively	(1,879)	(267)
Accumulated other comprehensive income (loss)	(28,434)	(30,655)
Total stockholders’ equity	2,513,292	2,362,123
Noncontrolling interest	101,204	101,946
Total equity	2,614,496	2,464,069
TOTAL LIABILITIES AND TOTAL EQUITY	$ 7,689,932	$ 7,558,457
Common Stock, Par Value (usd per share)	$ 1	$ 1
Common Stock Authorized (in shares)	100,000,000	100,000,000
Common Stock Issued (in shares)	62,772,996	61,480,658
Treasury Stock (in shares)	26,399	3,956