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PROPERTY AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2020
PROPERTY AND EQUIPMENT  
Schedule of property and equipment

    

As of December 31,

    

2020

    

2019

(in thousands)

Machinery and equipment

$

596,441

$

659,835

Buildings and leasehold improvements

 

93,236

 

97,426

Pipelines

72,458

69,327

Disposal wells

 

48,097

 

64,149

Vehicles and equipment

 

30,975

 

53,819

Land

13,497

16,030

Computer equipment and software

7,127

8,051

Office furniture and equipment

 

892

 

1,157

Machinery and equipment - finance lease

 

537

 

162

Vehicles and equipment - finance lease

 

475

 

1,291

Computer equipment and software - finance lease

 

356

 

356

Other

497

Construction in progress

 

14,811

 

43,279

 

878,902

 

1,015,379

Less accumulated depreciation(1)

 

(528,537)

 

(562,986)

Property and equipment held-for-sale, net

885

Total property and equipment, net

$

350,365

$

453,278

(1)Includes $1.1 million and $1.6 million of accumulated depreciation related to finance leases as of December 31, 2020 and December 31, 2019, respectively.
Schedule of amortization of intangible assets

Year ended December 31, 

    

2020

2019

    

2018

(in thousands)

Category

Depreciation expense from property and equipment

$

89,848

$

107,738

$

119,114

Amortization expense from finance leases

314

916

1,314

Amortization expense from intangible assets

11,661

11,900

13,102

Accretion expense from asset retirement obligations

(151)

115

183

Total depreciation and amortization

$

101,672

$

120,669

$

133,713