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Business Description And Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Accounts Receivable and Allowance for Doubtful Accounts
Following is a summary of accounts receivable as of December 31 (in thousands):

20212020
Billed Accounts Receivable$181,027 $146,899 
Unbilled Revenue$142,738 $126,065 
Less Allowance for Credit Losses$(2,113)$(7,003)
Accounts Receivable, net$321,652 $265,961 
Financing Receivable, Current, Allowance for Credit Loss
Changes to allowance for credit losses for the years ended December 31, were as follows (in thousands):
Balance at Beginning of YearAdditions Charged to Costs and ExpensesRecoveries and Other AdditionsWrite-offs and Other DeductionsBalance at End of Year
2021$7,003 $2,444 
(a)
$3,560 $(10,894)$2,113 
2020$2,444 $8,927 
(a)
$4,728 $(9,096)$7,003 
2019$3,209 $5,795 $3,942 $(10,502)$2,444 
_________________
(a)    Due to the COVID-19 pandemic, all of our jurisdictions temporarily suspended disconnections due to non-payment for a period of time, which increased our accounts receivable arrears balances. As a result, we increased our allowance for credit losses and bad debt expense for the year ended December 31, 2020 by an incremental $3.3 million. All jurisdiction disconnect moratoriums ended on or before May 3, 2021.
Materials, Supplies and Fuel
The following amounts by major classification are included in Materials, supplies and fuel on the accompanying Consolidated Balance Sheets as of December 31 (in thousands):
20212020
Materials and supplies$86,400 $85,250 
Fuel1,267 1,531 
Natural gas in storage 63,312 30,619 
Total materials, supplies and fuel$150,979 $117,400 
Investments
The following table presents the carrying value of our investments (in thousands), which are included in Other assets, non-current on the Consolidated Balance Sheets, as of December 31:
20212020
Investment in privately held oil and gas company$1,500 $1,500 
Cash surrender value of life insurance contracts12,365 13,628 
Other investments1,616 682 
Total investments$15,481 $15,810 
Property, Plant and Equipment (AFUDC) The following table presents AFUDC amounts (in thousands) for the years ended December 31:
Income Statement Location202120202019
AFUDC BorrowedInterest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts)$4,068 $5,617 $6,556 
AFUDC EquityOther income (expense), net593 318 472 
Goodwill As of December 31, 2021 and 2020, Goodwill balances were as follows (in thousands):
Electric UtilitiesGas UtilitiesTotal
Goodwill$257,244 $1,042,210 $1,299,454 
Intangible Assets Changes to intangible assets for the years ended December 31, were as follows (in thousands):
202120202019
Intangible assets, net, beginning balance$11,944 $13,266 $14,337 
Amortization expense (a)
(1,174)(1,322)(1,071)
Intangible assets, net, ending balance$10,770 $11,944 $13,266 
____________________
(a)    Amortization expense for existing intangible assets is expected to be $1.2 million for each year of the next five years.
Schedule of Accrued Liabilities
The following amounts by major classification are included in Accrued liabilities on the accompanying Consolidated Balance Sheets as of December 31 (in thousands):
20212020
Accrued employee compensation, benefits and withholdings$74,387 $77,806 
Accrued property taxes50,874 47,105 
Customer deposits and prepayments48,814 52,185 
Accrued interest33,680 31,520 
Other (none of which is individually significant)37,004 34,996 
Total accrued liabilities$244,759 $243,612 
Earnings Per Share of Common Stock
A reconciliation of share amounts used to compute earnings per share is as follows for the years ended December 31 (in thousands):
202120202019
Net income available for common stock$236,744 $227,608 $199,310 
Weighted average shares - basic63,219 62,378 60,662 
Dilutive effect of:
Equity compensation106 61 136 
Weighted average shares - diluted63,325 62,439 60,798 
Net income available for common stock, per share - Diluted$3.74 $3.65 $3.28 
Antidilutive Securities
The following securities were excluded from the diluted earnings per share computation for the years ended December 31 because of their anti-dilutive nature (in thousands):
202120202019
Equity compensation13 60 1 
Anti-dilutive shares excluded from computation of earnings per share13 60 1