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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.

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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.

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