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Condensed Consolidated Balance Sheets (unaudited) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 10,181 $ 6,356
Restricted cash and equivalents 4,753 4,383
Accounts receivable, net 181,956 265,961
Materials, supplies and fuel 145,743 117,400
Derivative assets, current 12,316 1,848
Income tax receivable, net 17,472 19,446
Regulatory assets, current 213,031 51,676
Other current assets 42,274 26,221
Total current assets 627,726 493,291
Property, plant and equipment 7,697,880 7,305,530
Less: accumulated depreciation and depletion (1,380,304) (1,285,816)
Total property, plant and equipment, net 6,317,576 6,019,714
Other assets:    
Goodwill 1,299,454 1,299,454
Intangible assets, net 11,063 11,944
Regulatory assets, non-current 617,024 226,582
Other assets, non-current 37,547 37,801
Total other assets, non-current 1,965,088 1,575,781
TOTAL ASSETS 8,910,390 8,088,786
Current liabilities:    
Accounts payable 142,130 183,340
Accrued liabilities 249,835 243,612
Derivative liabilities, current 3,471 2,044
Regulatory liabilities, current 30,156 25,061
Notes payable 332,525 234,040
Current maturities of long-term debt 0 8,436
Total current liabilities 758,117 696,533
Long-term debt, net of current maturities 4,125,571 3,528,100
Deferred credits and other liabilities:    
Deferred income tax liabilities, net 445,036 408,624
Regulatory liabilities, non-current 496,261 507,659
Benefit plan liabilities 150,727 150,556
Other deferred credits and other liabilities 134,776 134,667
Total deferred credits and other liabilities 1,226,800 1,201,506
Commitments, contingencies and guarantees (Note 3)
Equity:    
Common stock $1 par value; 100,000,000 shares authorized; issued 63,865,151 and 62,827,179 shares, respectively 63,865 62,827
Additional paid-in capital 1,726,277 1,657,285
Retained earnings 929,369 870,738
Treasury stock, at cost – 43,885 and 32,492 shares, respectively (2,819) (2,119)
Accumulated other comprehensive income (loss) (19,169) (27,346)
Total stockholders’ equity 2,697,523 2,561,385
Non-controlling interest 102,379 101,262
Total equity 2,799,902 2,662,647
TOTAL LIABILITIES AND TOTAL EQUITY $ 8,910,390 $ 8,088,786