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Segments | 3 Months Ended
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Mar. 31, 2019
Segment Reporting [Abstract] |
Segments | 19. 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 part 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. 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 |
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 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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