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Segments (Tables)
6 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Summary of revenue and other financial information by reportable segment

    

Contract

    

Aftermarket

    

(in thousands)

    

Operations

    

Services

    

Total

Three months ended June 30, 2021

 

  

 

  

 

  

Revenue

$

163,865

$

31,750

$

195,615

Gross margin

 

102,478

 

4,260

 

106,738

Three months ended June 30, 2020

 

  

 

  

 

  

Revenue

$

187,949

$

32,367

$

220,316

Gross margin

 

124,559

 

3,681

 

128,240

Six months ended June 30, 2021

 

  

 

  

 

  

Revenue

$

329,899

$

61,147

$

391,046

Gross margin

 

207,147

 

7,874

 

215,021

Six months ended June 30, 2020

 

  

 

  

 

  

Revenue

$

394,923

$

75,090

$

470,013

Gross margin

 

252,882

 

11,413

 

264,295

Reconciliation of net income (loss) to gross margin

Three Months Ended

    

Six Months Ended

June 30, 

June 30, 

(in thousands)

    

2021

    

2020

    

2021

    

2020

Total gross margin

$

106,738

$

128,240

$

215,021

$

264,295

Less:

 

  

 

  

 

  

 

  

Selling, general and administrative

 

26,077

 

28,745

 

51,161

 

59,371

Depreciation and amortization

 

44,193

 

48,849

 

89,905

 

98,671

Long-lived and other asset impairment

 

2,960

 

55,210

 

10,033

 

61,405

Goodwill impairment

99,830

Restructuring charges

743

2,408

1,640

4,136

Interest expense

 

25,958

 

25,778

 

57,203

 

55,443

Debt extinguishment loss

 

 

3,971

 

 

3,971

(Gain) loss on sale of assets, net

(3,124)

2,189

(14,156)

(1,927)

Other income, net

 

(82)

 

(438)

 

(1,971)

 

(993)

Income (loss) before income taxes

$

10,013

$

(38,472)

$

21,206

$

(115,612)