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Geographic Information
 12 Months Ended
Dec. 31, 2020
Segments, Geographical Areas [Abstract]  
Geographic Information GEOGRAPHIC INFORMATION
We attribute revenues to customers based on the location of the customer. The following table presents information related to our operations by geographic area:
As of December 31,
 2020 2019
Long-lived Assets   
United States$706,177  $564,047 
Canada29,768 24,684
Other2,415 834 
Total long-lived assets$738,360  $589,565 
Year Ended December 31,
202020192018
Revenues 
United States$955,436 $815,405 $734,748 
Canada45,08935,03136,728
Other31,750 16,497 15,662 
Total revenues$1,032,275 $866,933 $787,138 
BUSINESS SEGMENT INFORMATION
Our reportable segments for the year ended December 31, 2020 are U.S. Regions, U.S. Federal, Canada and Non-Solar Distributed Generation (“Non-Solar DG”).
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 which include the 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 the we own and O&M services for customer owned small-scale plants. Our U.S. Regions segment also includes certain small-scale solar grid-tie plants developed for customers. The “All Other” category offers enterprise energy management services, consulting services 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.
For the years ended December 31, 2020, 2019 and 2018 more than 71% of our revenues have been derived from federal, state, provincial or local government entities, including public housing authorities and public universities. The U.S. federal government, which is considered a single customer for reporting purposes, constituted 36.6%, 33.2% and 31.3% of our consolidated revenues for the years ended December 31, 2020, 2019 and 2018, respectively. Revenues from the U.S. federal government are included in our U.S. Federal segment.
The reports of our chief operating decision maker do not include assets at the operating segment level.
The table below presents our business segment information and reconciliation to our consolidated financial statements:
 U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Consolidated
2020
Revenues$400,526 $377,882 $47,797 $106,418 $99,652 $1,032,275 
Interest income136 77 — 16 21 250 
Interest expense5,783 1,771 852 4,369 116 12,891 
Depreciation and intangible asset amortization12,234 3,945 1,580 20,717 1,661 40,137 
Unallocated corporate activity— — — — — (40,188)
Income before taxes, excluding unallocated corporate activity27,565 44,560 2,560 13,040 8,891 96,616 
2019
Revenues365,060 287,426 37,910 84,683 91,854 866,933 
Interest income166 208 — 82 68 524 
Interest expense5,858 831 691 5,242 — 12,622 
Depreciation and intangible asset amortization9,934 3,427 1,386 21,359 1,603 37,709 
Unallocated corporate activity— — — — — (34,189)
Income before taxes, excluding unallocated corporate activity15,925 40,553 1,771 3,813 8,680 70,742 
2018
Revenues334,344 246,309 38,982 82,655 84,848 787,138 
Interest income9 126 — 147 — 282 
Interest expense6,188 1,045 1,917 6,172 22 15,344 
Depreciation and intangible asset amortization5,578 2,772 1,155 18,101 1,542 29,148 
Unallocated corporate activity— — — — — (30,415)
Income (loss) before taxes, excluding unallocated corporate activity20,543 36,332 (2,746)13,412 5,264 72,805 
See Note 3 for additional information about our revenues by product line.