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BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, plant and equipment    
Property, plant and equipment $ 7,274,268 $ 6,838,603
Accumulated depreciation and amortization 2,083,433 1,971,546
Net property, plant and equipment 5,190,835 4,867,057
Current assets    
Cash and cash equivalents 8,852 7,993
Accounts receivable, net 341,756 292,985
Materials and supplies 54,892 52,766
Natural gas in storage 179,646 93,946
Regulatory assets 1,611,676 56,773
Other current assets 27,742 35,406
Total current assets 2,224,564 539,869
Goodwill and other assets    
Regulatory assets 724,862 366,956
Goodwill 157,953 157,953
Other assets 103,906 96,877
Total goodwill and other assets 986,721 621,786
Total assets 8,402,120 6,028,712
Equity and long-term debt    
Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 53,633,210 shares at December 31, 2021; issued and outstanding 53,166,733 shares at December 31, 2020 536 532
Paid-in capital 1,790,362 1,756,921
Retained earnings 565,161 483,635
Accumulated other comprehensive income (loss) (6,527) (7,777)
Total equity 2,349,532 2,233,311
Long-term debt, excluding current maturities, and net of issuance costs of $12,418 and $13,159, respectively 3,683,378 1,582,428
Total equity and long-term debt 6,032,910 3,815,739
Current liabilities    
Notes payable 494,000 418,225
Accounts payable 258,554 152,313
Accrued taxes other than income 67,035 63,800
Customer deposits 62,454 68,028
Regulatory liabilities 8,090 15,761
Other current liabilities 90,360 78,952
Total current liabilities 980,493 797,079
Deferred credits and other liabilities [Abstract]    
Deferred Income Taxes 695,284 656,806
Regulatory Liability, Noncurrent 552,928 547,563
Employee benefit obligations 35,226 97,637
Other deferred credits 105,279 113,888
Total deferred credits and other liabilities 1,388,717 1,415,894
Commitments and Contingencies
Total liabilities and equity $ 8,402,120 $ 6,028,712