XML 58 R44.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Customer Concentrations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Customer Concentrations |
Schedule of revenue from customers | During the years ended December 31, 2018, 2017 and 2016, we generated 35.3%, 38.4% and 45.6%, of our revenue, respectively, from the following customers (in thousands):
|  |  |  | 2018 |  | 2017 |  | 2016 |
Description of Customer's Business |  | Segment |  | Amount |  | Percentage |  | Amount |  | Percentage |  | Amount |  | Percentage |
Public gas and electric utility |  | Utilities/Power |  | $ | 250,286 |  | 8.5% |  | $ | 210,747 |  | 8.9% |  | $ | 184,002 |  | 9.2% |
Private gas and electric utility |  | Utilities |  |  | 232,162 |  | 7.9% |  |  | 190,659 |  | 8.0% |  |  | 201,443 |  | 10.1% |
State DOT |  | Civil |  |  | 202,452 |  | 6.9% |  |  | 222,142 |  | 9.3% |  |  | 193,049 |  | 9.7% |
Pipeline operator |  | Pipeline |  |  | 198,198 |  | 6.7% |  |  | * |  | * |  |  | * |  | * |
Pipeline operator |  | Pipeline/Power |  |  | 155,280 |  | 5.3% |  |  | * |  | * |  |  | * |  | * |
Chemical/Energy producer |  | Power/Civil |  |  | * |  | * |  |  | 160,995 |  | 6.8% |  |  | 208,458 |  | 10.4% |
Pipeline operator |  | Pipeline |  |  | * |  | * |  |  | 128,182 |  | 5.4% |  |  | * |  | * |
Pipeline operator |  | Pipeline |  |  | * |  | * |  |  | * |  | * |  |  | 123,055 |  | 6.2% |
|  |  |  | $ | 1,038,378 |  | 35.3% |  | $ | 912,725 |  | 38.4% |  | $ | 910,007 |  | 45.6% |
(*)Indicates a customer with less than 5.0% of revenue during such period.

X
- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592 + Details
Name: | us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration