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Segments (Tables) | 3 Months Ended
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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 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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