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Segments (Tables)
3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Revenue and other financial information by reportable segment The following table presents revenue and gross margin by segment during the three months ended March 31, 2019 and 2018 (in thousands): 
 
Contract
Operations
 
Aftermarket
Services
 

Total
Three months ended March 31, 2019
 
 
 
 
 
Revenue
$
182,507

 
$
53,652

 
$
236,159

Gross margin
107,772

 
9,750

 
117,522

Three months ended March 31, 2018
 
 
 
 
 
Revenue
$
161,197

 
$
50,843

 
$
212,040

Gross margin
96,602

 
8,506

 
105,108

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

 
Three Months Ended
March 31,
 
2019
 
2018
Total gross margin
$
117,522

 
$
105,108

Less:
 
 
 
Selling, general and administrative
28,989

 
27,508

Depreciation and amortization
44,106

 
44,455

Long-lived asset impairment
3,092

 
4,710

Restatement and other charges
421

 
485

Interest expense
23,617

 
22,547

Merger-related costs
180

 
4,125

Other income, net
(205
)
 
(1,145
)
Income before income taxes
$
17,322


$
2,423