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Customer Concentrations | 12 Months Ended
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Dec. 31, 2017
Customer Concentrations |
Customer Concentrations | Note 15—Customer Concentrations We operate in multiple industry segments encompassing the construction of commercial, industrial, and public works infrastructure assets primarily throughout the United States. Typically, the top ten customers in any one calendar year generate revenues in excess of 50% of total revenues and consist of a different group of customers in each year. During the years ended December 31, 2017, 2016 and 2015, we generated 38.4%, 45.6% and 48.9%, of our revenues, respectively, from the following customers (in thousands):
|  |  |  | 2017 |  | 2016 |  | 2015 |
Description of Customer's Business |  | Segment |  | Amount |  | Percentage |  | Amount |  | Percentage |  | Amount |  | Percentage |
State DOT |  | Civil |  | $ | 222,142 |  | 9.3% |  | $ | 193,049 |  | 9.7% |  | $ | 183,847 |  | 9.5% |
Public gas and electric utility |  | Utilities |  |  | 210,747 |  | 8.9% |  |  | 184,002 |  | 9.2% |  |  | 120,507 |  | 6.2% |
Private gas and electric utility |  | Utilities |  |  | 190,659 |  | 8.0% |  |  | 201,443 |  | 10.1% |  |  | 173,232 |  | 9.0% |
Chemical/Energy producer |  | Power/Civil |  |  | 160,995 |  | 6.8% |  |  | 208,458 |  | 10.4% |  |  | 173,931 |  | 9.0% |
Pipeline operator |  | Pipeline |  |  | 128,182 |  | 5.4% |  |  | * |  | * |  |  | * |  | * |
Pipeline operator |  | Pipeline |  |  | * |  | * |  |  | 123,055 |  | 6.2% |  |  | * |  | * |
Pipeline operator |  | Pipeline |  |  | * |  | * |  |  | * |  | * |  |  | 165,578 |  | 8.6% |
Gas utility |  | Utilities |  |  | * |  | * |  |  | * |  | * |  |  | 127,128 |  | 6.6% |
|  |  |  | $ | 912,725 |  | 38.4% |  | $ | 910,007 |  | 45.6% |  | $ | 944,223 |  | 48.9% |
(*)Indicates a customer with less than 5% of revenues during such period. For the years ended December 31, 2017, 2016 and 2015, approximately 56.4%, 60.4% and 59.4%, respectively, of total revenues were generated from our top ten customers in that year. In each of the years, a different group of customers comprised the top ten customers by revenue. At December 31, 2017, approximately 4.3% of our accounts receivable were due from one customer, and that customer provided 8.9% of our revenues for the year ended December 31, 2017. At December 31, 2016, approximately 20.8% of our accounts receivable were due from one customer, and that customer provided 6.2% of our revenues for the year ended December 31, 2016.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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