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Segments | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Segments | 24. 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. During the years ended December 31, 2018, 2017 and 2016, Williams Partners accounted for 11%, 13% and 13%, respectively, of our contract operations and aftermarket services revenue. No other customer accounted for 10% or more of our revenue during these years. The following table presents revenue, gross margin and capital expenditures by segment during the years ended December 31, 2018, 2017 and 2016 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Segments Total |  | Other (1) |  | Total (2)
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 |
2017: |  |  |  |  |  |  |  |  |
Revenue | $ | 610,921 |  |  | $ | 183,734 |  |  | $ | 794,655 |  |  | $ | — |  |  | $ | 794,655 |
Gross margin | 347,916 |  |  | 27,817 |  |  | 375,733 |  |  | — |  |  | 375,733 |
Capital expenditures | 211,651 |  |  | 3,429 |  |  | 215,080 |  |  | 6,613 |  |  | 221,693 |
2016: |  |  |  |  |  |  |  |  |
Revenue | $ | 647,828 |  |  | $ | 159,241 |  |  | $ | 807,069 |  |  | $ | — |  |  | $ | 807,069 |
Gross margin | 400,788 |  |  | 26,362 |  |  | 427,150 |  |  | — |  |  | 427,150 |
Capital expenditures | 111,170 |  |  | 1,123 |  |  | 112,293 |  |  | 5,279 |  |  | 117,572 |
——————
(1) | Includes corporate-related items.
(2) | Excludes capital expenditures and the operating results of discontinued operations.
The following table presents assets by segment reconciled to total assets per the consolidated balance sheets (in thousands):
| December 31,
| 2018 |  | 2017
Contract operations | $ | 2,155,270 |  |  | $ | 2,063,178 |
Aftermarket services | 92,101 |  |  | 104,440 |
Assets from segments | 2,247,371 |  |  | 2,167,618 |
Other assets (1) | 297,781 |  |  | 226,826 |
Assets associated with discontinued operations | 7,363 |  |  | 13,563 |
Total assets | $ | 2,552,515 |  |  | $ | 2,408,007 |
——————
(1) | Includes corporate-related items.
The following table reconciles total gross margin to net income (loss) before income taxes (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Total gross margin | $ | 440,074 |  |  | $ | 375,733 |  |  | $ | 427,150 |
Less: |  |  |  |  |
Selling, general and administrative | 101,563 |  |  | 111,483 |  |  | 114,470 |
Depreciation and amortization | 174,946 |  |  | 188,563 |  |  | 208,986 |
Long-lived asset impairment | 28,127 |  |  | 29,142 |  |  | 87,435 |
Restatement and other charges | 19 |  |  | 4,370 |  |  | 13,470 |
Restructuring and other charges | — |  |  | 1,386 |  |  | 16,901 |
Interest expense | 93,328 |  |  | 88,760 |  |  | 83,899 |
Debt extinguishment loss | 2,450 |  |  | 291 |  |  | — |
Merger-related costs | 10,162 |  |  | 275 |  |  | — |
Other income, net | (5,831 | ) |  | (5,918 | ) |  | (8,590 | )
Income (loss) before income taxes | $ | 35,310 |  |  | $ | (42,619 | ) |  | $ | (89,421 | )

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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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