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Segments | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Segments | 28. 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 parts 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. No single customer accounted for 10% or more of our revenue during the years ended December 31, 2020 and 2019. During the year ended December 31, 2018, Williams Partners accounted for 11% of our contract operations and aftermarket services revenue. The following table presents revenue, gross margin and capital expenditures by segment during the years ended December 31, 2020, 2019 and 2018 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Contract |  | Aftermarket |  | Segments |  | ​ |  | ​ | ​
​ |  | Operations |  | Services |  | Total |  | Other (1) |  | Total
2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Revenue | ​ | $ | 738,918 | ​ | $ | 136,052 | ​ | $ | 874,970 | ​ | $ | — | ​ | $ | 874,970
Gross margin | ​ |  | 477,831 | ​ |  | 19,946 | ​ |  | 497,777 | ​ |  | — | ​ |  | 497,777
Capital expenditures | ​ | ​ | 133,492 | ​ |  | 5,308 | ​ |  | 138,800 | ​ |  | 1,502 | ​ |  | 140,302
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Revenue | ​ | $ | 771,539 | ​ | $ | 193,946 | ​ | $ | 965,485 | ​ | $ | — | ​ | $ | 965,485
Gross margin | ​ |  | 474,279 | ​ |  | 34,968 | ​ |  | 509,247 | ​ |  | — | ​ |  | 509,247
Capital expenditures | ​ |  | 374,650 | ​ |  | 8,714 | ​ |  | 383,364 | ​ |  | 1,834 | ​ |  | 385,198
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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
(1) | Corporate-related items.
​ The following table presents assets by segment reconciled to total assets per the consolidated balance sheets (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ |  | 2020 | ​ | 2019
Contract operations | ​ | $ | 2,593,864 | ​ | $ | 2,915,724
Aftermarket services | ​ |  | 45,985 | ​ |  | 67,832
Segment assets | ​ | ​ | 2,639,849 | ​ | ​ | 2,983,556
Other assets (1) | ​ | ​ | 128,837 | ​ | ​ | 113,518
Assets associated with discontinued operations | ​ | ​ | 11,036 | ​ | ​ | 12,901
Total assets | ​ | $ | 2,779,722 | ​ | $ | 3,109,975
(1) | Corporate-related items.
The following table reconciles total gross margin to income (loss) before income taxes (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2020 |  | 2019 |  | 2018
Total gross margin | ​ | $ | 497,777 | ​ | $ | 509,247 | ​ | $ | 440,074
Less: | ​ |  |  | ​ |  |  | ​ |  |
Selling, general and administrative | ​ |  | 105,100 | ​ |  | 117,727 | ​ |  | 101,563
Depreciation and amortization | ​ |  | 193,138 | ​ |  | 188,084 | ​ |  | 174,946
Long-lived and other asset impairment | ​ |  | 79,556 | ​ |  | 44,663 | ​ |  | 28,127
Goodwill impairment | ​ | ​ | 99,830 | ​ | ​ | — | ​ | ​ | —
Restatement and other charges | ​ |  | — | ​ |  | 445 | ​ |  | 19
Restructuring charges | ​ | ​ | 8,450 | ​ | ​ | — | ​ | ​ | —
Interest expense | ​ |  | 105,716 | ​ |  | 104,681 | ​ |  | 93,328
Debt extinguishment loss | ​ |  | 3,971 | ​ |  | 3,653 | ​ |  | 2,450
Transaction-related costs | ​ |  | — | ​ |  | 8,213 | ​ |  | 10,162
Gain on sale of assets, net | ​ | ​ | (10,643) | ​ | ​ | (16,016) | ​ | ​ | (5,674)
Other income, net | ​ |  | (1,359) | ​ |  | (661) | ​ |  | (157)
Income (loss) before income taxes | ​ | $ | (85,982) | ​ | $ | 58,458 | ​ | $ | 35,310
​

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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