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Business Description And Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
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):
2020Billed Accounts ReceivableUnbilled RevenueLess Allowance for Credit LossesAccounts Receivable, net
Electric Utilities$45,841 $32,915 $(1,269)$77,487 
Gas Utilities95,592 93,150 (5,734)183,008 
Power Generation1,837 — — 1,837 
Mining2,511 — — 2,511 
Corporate1,118 — — 1,118 
Total$146,899 $126,065 $(7,003)$265,961 
2019Billed Accounts ReceivableUnbilled RevenueLess Allowance for Credit LossesAccounts Receivable, net
Electric Utilities$41,428 $33,886 $(592)$74,722 
Gas Utilities97,607 79,616 (1,683)175,540 
Power Generation2,164 — — 2,164 
Mining2,277 — — 2,277 
Corporate1,271 — (169)1,102 
Total$144,747 $113,502 $(2,444)$255,805 
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
2020$2,444 $8,927 
(a)
$4,728 $(9,096)$7,003 
2019$3,209 $5,795 $3,942 $(10,502)$2,444 
2018$3,081 $6,859 $4,092 $(10,823)$3,209 
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(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. The ongoing credit evaluation of our customers during the COVID-19 pandemic is further discussed in the Credit Risk section of Note 11.
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):
20202019
Materials and supplies$85,250 $82,809 
Fuel1,531 2,425 
Natural gas in storage 30,619 31,938 
Total materials, supplies and fuel$117,400 $117,172 
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:
20202019
Investment in privately held oil and gas company$1,500 $8,359 
Cash surrender value of life insurance contracts13,628 13,056 
Other investments682 514 
Total investments$15,810 $21,929 
Goodwill As of December 31, 2020 and 2019, Goodwill balances were as follows (in thousands):
Electric UtilitiesGas UtilitiesPower GenerationTotal
Goodwill$248,479 $1,042,210 $8,765 $1,299,454 
Intangible Assets Changes to intangible assets for the years ended December 31, were as follows (in thousands):
202020192018
Intangible assets, net, beginning balance$13,266 $14,337 $7,559 
Additions— — 7,602 
Amortization expense (a)
(1,322)(1,071)(824)
Intangible assets, net, ending balance$11,944 $13,266 $14,337 
_________________
(a)    Amortization expense for existing intangible assets is expected to be $1.3 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):
20202019
Accrued employee compensation, benefits and withholdings$77,806 $62,837 
Accrued property taxes47,105 44,547 
Customer deposits and prepayments52,185 54,728 
Accrued interest31,520 31,868 
Other (none of which is individually significant)34,996 32,787 
Total accrued liabilities$243,612 $226,767 
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):
202020192018
Net income available for common stock$227,608 $199,310 $258,442 
Weighted average shares - basic62,378 60,662 54,420 
Dilutive effect of:
Equity Units— — 898 
Equity compensation61 136 168 
Weighted average shares - diluted62,439 60,798 55,486 
Net income available for common stock, per share - Diluted$3.65 $3.28 $4.66 
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):
202020192018
Equity compensation60 1 16 
Anti-dilutive shares excluded from computation of earnings per share60 1 16