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Segments (Tables)
3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Summary of revenue and other financial information by reportable segment

    

Contract

    

Aftermarket

    

(in thousands)

    

Operations

    

Services

    

Total

Three months ended March 31, 2021

 

  

 

  

 

  

Revenue

$

166,034

$

29,397

$

195,431

Gross margin

 

104,669

 

3,614

 

108,283

Three months ended March 31, 2020

 

  

 

  

 

  

Revenue

$

206,974

$

42,723

$

249,697

Gross margin

 

128,323

 

7,732

 

136,055

Reconciliation of net income (loss) to gross margin

    

Three Months Ended

March 31, 

(in thousands)

    

2021

    

2020

Total gross margin

$

108,283

$

136,055

Less:

 

  

 

  

Selling, general and administrative

 

25,084

 

30,626

Depreciation and amortization

 

45,712

 

49,822

Long-lived and other asset impairment

 

7,073

 

6,195

Goodwill impairment

99,830

Restructuring charges

897

1,728

Interest expense

 

31,245

 

29,665

Gain on sale of assets, net

(11,032)

(4,116)

Other income, net

 

(1,889)

 

(555)

Income (loss) before income taxes

$

11,193

$

(77,140)