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Segments
12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segments

28. Segments

We manage our business segments primarily based on the type of product or service provided. We have two segments which we operate within the U.S.: contract operations and aftermarket services. The contract operations segment primarily provides natural gas compression services to meet specific customer requirements. The aftermarket services segment provides a full range of services to support the compression needs of customers, from parts sales and normal maintenance services to full operation of a customer’s owned assets. We evaluate the performance of our segments based on gross margin for each segment. Revenue includes only sales to external customers.

No single customer accounted for 10% or more of our revenue during the years ended December 31, 2020 and 2019. During the year ended December 31, 2018, Williams Partners accounted for 11% of our contract operations and aftermarket services revenue.

The following table presents revenue, gross margin and capital expenditures by segment during the years ended December 31, 2020, 2019 and 2018 (in thousands):

    

Contract

    

Aftermarket

    

Segments

    

    

    

Operations

    

Services

    

Total

    

Other (1)

    

Total

2020

 

  

 

  

 

  

 

  

 

  

Revenue

$

738,918

$

136,052

$

874,970

$

$

874,970

Gross margin

 

477,831

 

19,946

 

497,777

 

 

497,777

Capital expenditures

133,492

 

5,308

 

138,800

 

1,502

 

140,302

2019

 

  

 

  

 

  

 

  

 

  

Revenue

$

771,539

$

193,946

$

965,485

$

$

965,485

Gross margin

 

474,279

 

34,968

 

509,247

 

 

509,247

Capital expenditures

 

374,650

 

8,714

 

383,364

 

1,834

 

385,198

2018

 

  

 

  

 

  

 

  

 

  

Revenue

$

672,536

$

231,905

$

904,441

$

$

904,441

Gross margin

 

399,523

 

40,551

 

440,074

 

 

440,074

Capital expenditures

 

307,048

 

6,111

 

313,159

 

5,943

 

319,102

(1)Corporate-related items.

The following table presents assets by segment reconciled to total assets per the consolidated balance sheets (in thousands):

    

December 31, 

    

2020

2019

Contract operations

$

2,593,864

$

2,915,724

Aftermarket services

 

45,985

 

67,832

Segment assets

2,639,849

2,983,556

Other assets (1)

128,837

113,518

Assets associated with discontinued operations

11,036

12,901

Total assets

$

2,779,722

$

3,109,975

(1)Corporate-related items.

The following table reconciles total gross margin to income (loss) before income taxes (in thousands):

Year Ended December 31, 

2020

    

2019

    

2018

Total gross margin

$

497,777

$

509,247

$

440,074

Less:

 

  

 

  

 

  

Selling, general and administrative

 

105,100

 

117,727

 

101,563

Depreciation and amortization

 

193,138

 

188,084

 

174,946

Long-lived and other asset impairment

 

79,556

 

44,663

 

28,127

Goodwill impairment

99,830

Restatement and other charges

 

 

445

 

19

Restructuring charges

8,450

Interest expense

 

105,716

 

104,681

 

93,328

Debt extinguishment loss

 

3,971

 

3,653

 

2,450

Transaction-related costs

 

 

8,213

 

10,162

Gain on sale of assets, net

(10,643)

(16,016)

(5,674)

Other income, net

 

(1,359)

 

(661)

 

(157)

Income (loss) before income taxes

$

(85,982)

$

58,458

$

35,310