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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Disaggregation of revenue
The following table disaggregates the Company’s operating revenue by source for the years ended December 31, 2020, 2019, and 2018:
202020192018
Revenue from contracts with customers$697,577 $664,358 $674,736 
Regulatory balancing account revenue96,730 50,199 23,460 
Total operating revenue$794,307 $714,557 $698,196 
In the following table, revenue from contracts with customers is disaggregated by class of customers for the years ended December 31, 2020, 2019, and 2018:
202020192018
Residential$486,065 $446,323 $450,062 
Business125,819 129,223 130,041 
Industrial29,088 31,857 34,236 
Public authorities35,776 33,862 34,511 
Other*20,829 23,093 25,886 
Total revenue from contracts with customers$697,577 $664,358 $674,736 
_______________________________________________________________________________
*    Other includes accrued unbilled revenue
The following tables disaggregate the Company’s non-regulated revenue by source for the years ended December 31, 2020, 2019, and 2018:
202020192018
Operating and maintenance revenue$11,481 $12,655 $10,392 
Other non-regulated revenue3,043 4,271 5,413 
Non-regulated revenue from contracts with customers$14,524 $16,926 $15,805 
Lease revenue2,398 2,279 2,467 
Total non-regulated revenue$16,922 $19,205 $18,272 
Schedule of lease payments to be received
Maturities of lease payments to be received are as follows:
Year Ending December 31,Operating Leases
2021$2,779 
20221,916 
20231,438 
20241,152 
2025688 
Thereafter319 
Schedule of activities in the allowance for doubtful accounts
The following table presents the activity in the allowance for credit losses for the period ended December 31, 2020, 2019 and 2018.
 202020192018
Beginning Balance$771 $757 773 
Provision for credit loss expense5,716 1,664 $1,703 
Write-offs(1,730)(2,156)$(2,210)
Recoveries489 506 $491 
Total ending allowance balance$5,246 $771 $757 
Other Receivables
As of December 31, 2020 and 2019, other receivables were:
 20202019
Accounts receivables from developers9,077 6,299 
Income tax receivables5,561 764 
Other5,693 7,124 
Total other receivables$20,331 $14,187 
Schedule of depreciable plant and equipment
The following table represents depreciable plant and equipment as of December 31:
 20202019
Equipment$785,578 $726,475 
Office buildings and other structures305,791 281,462 
Transmission and distribution plant2,554,401 2,227,478 
Total$3,645,770 $3,235,415 
Schedule of estimated useful lives of depreciable plant and equipment
Depreciation of utility plant is computed on a straight-line basis over the assets' estimated useful lives including cost of removal of certain assets as follows:
 Useful Lives
Equipment
5 to 50 years
Transmission and distribution plant
40 to 65 years
Office Buildings and other structures50 years
Schedule of allowance for funds used during construction
The amount of AFUDC related to equity funds and to borrowed funds for 2020, 2019, and 2018 are shown in the table below:
 202020192018
Allowance for equity funds used during construction$4,976 $6,685 $3,954 
Allowance for borrowed funds used during construction3,185 3,670 2,063 
Total$8,161 $10,355 $6,017 
Schedule of cash, cash equivalents and restricted cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash within the Consolidated Balance Sheets that total to the amounts shown on the Consolidated Statements of Cash Flows:
 December 31, 2020December 31, 2019
Cash and cash equivalents44,555 42,653 
Restricted cash (included in "taxes, prepaid expenses, and other assets")574 645 
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows$45,129 $43,298 
Schedule Of Customer Advances For Construction, Refunds Due Estimated refunds of advances are shown in the table below.
Year Ending December 31,Refunds of Advances
2021$8,935 
20228,841 
20238,791 
20248,689 
20258,434 
Thereafter151,935 
Total refunds$195,625 
Schedule of SARs which were dilutive
 202020192018
 (In thousands,
except per share data)
Net income available to common stockholders$96,831 $63,116 $65,584 
Weighted average common shares, basic 49,274 48,168 48,060 
Weighted average common shares, dilutive 49,274 48,168 48,060 
Earnings per share—basic$1.97 $1.31 $1.36 
Earnings per share—diluted$1.97 $1.31 $1.36