Revenues (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables summarize revenues by segment and geography (in thousands):

	Quarter Ended March 31, 2018
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Primary geographic region:
United States	$	93,845	$	63,858	$	92,329	$	250,032
Canada	12,269		16,570		—		28,839
Europe	13,143		2,866		—		16,009
Other foreign	15,170		14,811		—		29,981
Total revenues	$	134,427	$	98,105	$	92,329	$	324,861

	Quarter Ended March 31, 2017
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Primary geographic region:
United States	$	93,904	$	90,903	$	72,917	$	257,724
Canada	10,817		16,010		—		26,827
Europe	12,960		3,185		—		16,145
Other foreign	11,187		13,292		—		24,479
Total revenues	$	128,868	$	123,390	$	72,917	$	325,175

The following tables summarize revenues by segment and contract type (in thousands):

	Quarter Ended March 31, 2018
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	125,263	$	77,901	$	5,757	$	208,921
Time and materials	—		13,107		86,572		99,679
Product sales	9,144		7,097		—		16,241
License fees	20		—		—		20
Total revenues	$	134,427	$	98,105	$	92,329	$	324,861

	Quarter Ended March 31, 2017
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	118,998	$	98,520	$	1,507	$	219,025
Time and materials	—		11,476		71,410		82,886
Product sales	9,714		13,394		—		23,108
License fees	156		—		—		156
Total revenues	$	128,868	$	123,390	$	72,917	$	325,175

Contract Asset and Liability

Net contract assets (liabilities) consisted of the following (in thousands):

	March 31, 2018			December 31, 2017
Contract assets – current	$	81,052		$	75,371
Contract assets – noncurrent (1)	11			—
Contract liabilities – current	(45,139		)	(51,597		)
Net contract assets (liabilities)	$	35,924		$	23,774

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⁽¹⁾  Included in “Other assets” on the Consolidated Balance Sheets.