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Reportable Segments and Geographic Information | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Reportable Segments and Geographic Information | 22. Reportable Segments and Geographic Information We manage our business segments primarily based upon the type of product or service provided. We have two reportable 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. We do not include intersegment sales when we evaluate our segments’ performance. During each of the years ended December 31, 2015 and 2014, Williams Partners, L.P. accounted for approximately 12% and 10%, respectively, of our consolidated revenue. No other customer accounted for more than 10% of our consolidated revenue during the years ended December 31, 2015 and 2014 and no single customer accounted for more than 10% of our consolidated revenue during the year ended December 31, 2013. The following table presents sales and other financial information by reportable segment during the years ended December 31, 2015, 2014 and 2013 (in thousands):
| Contract Operations |  | Aftermarket Services |  | Reportable Segments Total |  | Other (1) |  | Total (2)
2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ | 781,166 |  |  | $ | 216,942 |  |  | $ | 998,108 |  |  | $ | — |  |  | $ | 998,108 |
Gross margin (3) | 461,765 |  |  | 41,297 |  |  | 503,062 |  |  | — |  |  | 503,062 |
Total assets | 2,248,191 |  |  | 149,008 |  |  | 2,397,199 |  |  | 287,944 |  |  | 2,685,143 |
Capital expenditures | 227,248 |  |  | 2,296 |  |  | 229,544 |  |  | 26,598 |  |  | 256,142 |
2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ | 729,103 |  |  | $ | 230,050 |  |  | $ | 959,153 |  |  | $ | — |  |  | $ | 959,153 |
Gross margin (3) | 412,961 |  |  | 41,799 |  |  | 454,760 |  |  | — |  |  | 454,760 |
Total assets | 2,446,633 |  |  | 62,485 |  |  | 2,509,118 |  |  | 334,516 |  |  | 2,843,634 |
Capital expenditures | 371,734 |  |  | 825 |  |  | 372,559 |  |  | 11,282 |  |  | 383,841 |
2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers | $ | 627,844 |  |  | $ | 234,928 |  |  | $ | 862,772 |  |  | $ | — |  |  | $ | 862,772 |
Gross margin (3) | 345,355 |  |  | 46,439 |  |  | 391,794 |  |  | — |  |  | 391,794 |
Total assets | 1,907,097 |  |  | 67,693 |  |  | 1,974,790 |  |  | 238,220 |  |  | 2,213,010 |
Capital expenditures | 275,408 |  |  | 935 |  |  | 276,343 |  |  | 15,187 |  |  | 291,530 |
(1) | Includes corporate related items.
(2) | Totals exclude assets, capital expenditures and the operating results of discontinued operations.
(3) | Gross margin, a non-GAAP financial measure, is reconciled, in total, to net income (loss), its most directly comparable measure calculated and presented in accordance with U.S. GAAP, below.
The following table presents assets from reportable segments to total assets as of December 31, 2015 and 2014 (in thousands):
| December 31,
| 2015 |  | 2014
Assets from reportable segments | $ | 2,397,199 |  |  | $ | 2,509,118 |
Other assets (1) | 287,944 |  |  | 334,516 |
Assets associated with discontinued operations | 21,620 |  |  | 2,049,685 |
Consolidated assets | $ | 2,706,763 |  |  | $ | 4,893,319 |
(1) | Includes corporate related items.
We define gross margin as total revenue less cost of sales (excluding depreciation and amortization expense). Gross margin is included as a supplemental disclosure because it is a primary measure used by our management to evaluate the results of revenue and cost of sales (excluding depreciation and amortization expense), which are key components of our operations. As an indicator of our operating performance, gross margin should not be considered an alternative to, or more meaningful than, net income (loss) as determined in accordance with GAAP. Our gross margin may not be comparable to a similarly titled measure of another company because other entities may not calculate gross margin in the same manner. The following table reconciles net income (loss) to gross margin (in thousands):
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Net income (loss) | $ | (125,697 | ) |  | $ | 88,661 |  |  | $ | 126,606 |
Selling, general and administrative | 131,919 |  |  | 132,651 |  |  | 118,851 |
Depreciation and amortization | 229,127 |  |  | 212,268 |  |  | 187,476 |
Long-lived asset impairment | 124,979 |  |  | 42,828 |  |  | 16,696 |
Restructuring charges | 4,745 |  |  | 5,394 |  |  | — |
Goodwill impairment | 3,738 |  |  | — |  |  | — |
Interest expense | 107,617 |  |  | 112,273 |  |  | 112,194 |
Debt extinguishment costs | 9,201 |  |  | — |  |  | — |
Other (income) expense, net | (2,079 | ) |  | (5,475 | ) |  | (22,535 | )
Provision for (benefit from) income taxes | 53,189 |  |  | (28,066 | ) |  | (17,840 | )
Income from discontinued operations, net of tax | (33,677 | ) |  | (105,774 | ) |  | (129,654 | )
Gross margin | $ | 503,062 |  |  | $ | 454,760 |  |  | $ | 391,794 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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