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Business Segment Information | 6 Months Ended
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Jun. 30, 2021
Segment Reporting [Abstract] |
Business Segment Information | BUSINESS SEGMENT INFORMATION Our reportable segments for the three and six months ended June 30, 2021 were U.S. Regions, U.S. Federal, Canada and Non-Solar DG. On January 1, 2021, we changed the structure of our internal organization and our U.S. Regions segment now includes our U.S.-based enterprise energy management services previously included in our “All Other” segment. As a result, previously reported amounts have been reclassified for comparative purposes. Our U.S. Regions, U.S. Federal and Canada segments offer energy efficiency products and services which include the design, engineering and installation of equipment and other measures to improve the efficiency and control the operation of a facility’s energy infrastructure, renewable energy solutions and services and the development and construction of small-scale plants that Ameresco owns or develops for customers that produce electricity, gas, heat or cooling from renewable sources of energy and O&M services. Our Non-Solar DG segment sells electricity, processed renewable gas fuel, heat or cooling, produced from renewable sources of energy, other than solar, and generated by small-scale plants that we own and O&M services for customer-owned small-scale plants. The “All Other” category includes enterprise energy management services, other than the U.S.-based portion; consulting services, energy efficiency products and services outside of the U.S. and Canada; and the sale of solar PV energy products and systems which we refer to as integrated-PV. These segments do not include results of other activities, such as corporate operating expenses not specifically allocated to the segments. Certain reportable segments are an aggregation of operating segments. The tables below presents our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-Solar DG |  | All Other |  | Total Consolidated
Three Months Ended June 30, 2021 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 109,470 |  |  | $ | 90,200 |  |  | $ | 10,874 |  |  | $ | 35,571 |  |  | $ | 27,805 |  |  | $ | 273,920 |
Interest income | 34 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 34 |
Interest expense | 1,325 |  |  | 326 |  |  | 240 |  |  | 3,000 |  |  | 60 |  |  | 4,951 |
Depreciation and amortization of intangible assets | 4,030 |  |  | 1,139 |  |  | 484 |  |  | 4,937 |  |  | 274 |  |  | 10,864 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10,070) |
Income before taxes, excluding unallocated corporate activity | 7,379 |  |  | 11,082 |  |  | 751 |  |  | 5,093 |  |  | 1,755 |  |  | 26,060 |
Three Months Ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 89,574 |  |  | $ | 84,491 |  |  | $ | 9,035 |  |  | $ | 23,129 |  |  | $ | 16,807 |  |  | $ | 223,036 |
Interest income | 34 |  |  | 34 |  |  | — |  |  | 2 |  |  | — |  |  | 70 |
Interest expense | 2,190 |  |  | 345 |  |  | 165 |  |  | 1,128 |  |  | 18 |  |  | 3,846 |
Depreciation and amortization of intangible assets | 3,098 |  |  | 942 |  |  | 381 |  |  | 5,420 |  |  | 330 |  |  | 10,171 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10,395) |
Income before taxes, excluding unallocated corporate activity | 5,202 |  |  | 9,945 |  |  | 516 |  |  | 2,906 |  |  | 662 |  |  | 19,231 |
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-Solar DG |  | All Other |  | Total Consolidated
Six Months Ended June 30, 2021 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 194,743 |  |  | $ | 192,414 |  |  | $ | 22,517 |  |  | $ | 65,939 |  |  | $ | 50,509 |  |  | $ | 526,122 |
Interest income | 68 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 70 |
Interest expense (1) | 3,334 |  |  | 650 |  |  | 626 |  |  | 2,536 |  |  | 203 |  |  | 7,349 |
Depreciation and amortization of intangible assets | 7,605 |  |  | 2,149 |  |  | 899 |  |  | 9,799 |  |  | 561 |  |  | 21,013 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (21,230) |
Income before taxes, excluding unallocated corporate activity | 10,889 |  |  | 23,112 |  |  | 666 |  |  | 13,721 |  |  | 3,468 |  |  | 51,856 |
Six Months Ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |
Revenues | $ | 175,414 |  |  | $ | 153,236 |  |  | $ | 20,427 |  |  | $ | 45,853 |  |  | $ | 40,519 |  |  | $ | 435,449 |
Interest income | 70 |  |  | 74 |  |  | — |  |  | 16 |  |  | — |  |  | 160 |
Interest expense (1) | 3,671 |  |  | 1,091 |  |  | 337 |  |  | 2,173 |  |  | 33 |  |  | 7,305 |
Depreciation and amortization of intangible assets | 5,960 |  |  | 1,959 |  |  | 772 |  |  | 10,707 |  |  | 607 |  |  | 20,005 |
Unallocated corporate activity | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (20,712) |
Income before taxes, excluding unallocated corporate activity | 9,240 |  |  | 17,039 |  |  | 295 |  |  | 4,575 |  |  | 2,532 |  |  | 33,681 |
(1) Includes gains recognized on derivative instruments during the three months ended March 31, 2021 and 2020, which were offset by losses in the three months ended June 30, 2021 and 2020. See Note 11 for additional information.
See Note 3 for additional information about our revenues by product line.

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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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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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