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SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2020
SIGNIFICANT ACCOUNTING POLICIES  
Schedule of change in allowance for doubtful accounts

The change in the allowance for credit losses is as follows:

For the year ended December 31,

2020

2019

    

2018

(in thousands)

Balance at beginning of year

$

5,773

 

$

5,329

 

$

2,979

Increase to allowance based on a percent of revenue

 

1,212

 

 

2,641

 

 

2,253

Adjustment based on aged receivable analysis

5,161

(88)

(43)

Charge-offs

 

(3,003)

 

 

(2,504)

 

 

(23)

Recoveries

14

 

 

395

 

 

163

Balance at end of year

$

9,157

 

$

5,773

 

$

5,329

Schedule of estimated useful life of property and equipment

Asset Classification

    

Useful Life (years)

Land

 

Indefinite

Buildings and leasehold improvements

 

30 or lease term

Vehicles and equipment

 

4 - 7 or lease term

Machinery and equipment

 

2 - 15

Computer equipment and software

 

3 - 4 or lease term

Office furniture and equipment

 

7

Disposal wells

 

7 - 10

Summary of change in asset retirement obligations

For the year ended December 31,

2020

    

2019

(in thousands)

Balance at December 31, 2019

$

1,527

 

$

1,898

Accretion expense, included in depreciation and amortization expense

121

 

115

Disposals, included in depreciation and amortization expense

(272)

 

Payments

(377)

(486)

Balance at December 31, 2020

$

999

 

$

1,527