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Segments (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Revenue and other financial information by reportable segment
The following table presents revenue and other financial information by segment during the three months ended March 31, 2018 and 2017 (in thousands): 
 
Contract
Operations
 
Aftermarket
Services
 
Segments
Total
Three months ended March 31, 2018:
 
 
 
 
 
Revenue
$
161,197

 
$
50,843

 
$
212,040

Gross margin
96,602

 
8,506

 
105,108

 
 
 
 
 
 
Three months ended March 31, 2017:
 
 
 
 
 
Revenue
$
149,984

 
$
39,901

 
$
189,885

Gross margin
85,887

 
6,169

 
92,056
Reconciliation of net income (loss) to gross margin
The following table reconciles total gross margin to income (loss) before income taxes (in thousands):
 
Three Months Ended March 31,
 
2018
 
2017
Total gross margin
$
105,108

 
$
92,056

Less:
 
 
 
Selling, general and administrative
27,508

 
27,553

Depreciation and amortization
44,455

 
47,772

Long-lived asset impairment
4,710

 
8,245

Restatement and other charges
485

 
801

Restructuring and other charges
—

 
457

Interest expense
22,547

 
21,421

Debt extinguishment costs
—

 
291

Merger-related costs
4,125

 
—

Other income, net
(1,145
)
 
(794
)
Income (loss) before income taxes
$
2,423


$
(13,690
)