Revenues (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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

	Quarter Ended September 30, 2018
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Primary geographic region:
United States	$	111,902	$	72,022	$	78,374	$	262,298
Canada	16,153		19,767		—		35,920
Europe	13,460		2,821		—		16,281
Other foreign	14,166		11,014		—		25,180
Total revenues	$	155,681	$	105,624	$	78,374	$	339,679

	Nine Months Ended September 30, 2018
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Primary geographic region:
United States	$	323,327	$	207,267	$	248,612	$	779,206
Canada	44,028		51,157		—		95,185
Europe	39,600		8,535		—		48,135
Other foreign	43,885		33,159		—		77,044
Total revenues	$	450,840	$	300,118	$	248,612	$	999,570

	Quarter Ended September 30, 2017
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Primary geographic region:
United States	$	128,356	$	57,024	$	65,435	$	250,815
Canada	17,936		24,003		—		41,939
Europe	13,900		3,467		—		17,367
Other foreign	13,969		17,782		—		31,751
Total revenues	$	174,161	$	102,276	$	65,435	$	341,872

	Nine Months Ended September 30, 2017
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Primary geographic region:
United States	$	328,627	$	241,620	$	216,799	$	787,046
Canada	42,170		55,883		—		98,053
Europe	41,196		10,460		—		51,656
Other foreign	39,347		45,418		—		84,765
Total revenues	$	451,340	$	353,381	$	216,799	$	1,021,520

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

	Quarter Ended September 30, 2018
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	141,598	$	68,935	$	2,069	$	212,602
Time and materials	—		25,612		76,305		101,917
Product sales	11,679		11,077		—		22,756
License fees	2,404		—		—		2,404
Total revenues	$	155,681	$	105,624	$	78,374	$	339,679

	Nine Months Ended September 30, 2018
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	416,392	$	210,819	$	13,793	$	641,004
Time and materials	—		60,160		234,819		294,979
Product sales	32,011		29,139		—		61,150
License fees	2,437		—		—		2,437
Total revenues	$	450,840	$	300,118	$	248,612	$	999,570

	Quarter Ended September 30, 2017
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	163,043	$	76,419	$	1,548	$	241,010
Time and materials	—		14,188		63,887		78,075
Product sales	10,987		11,669		—		22,656
License fees	131		—		—		131
Total revenues	$	174,161	$	102,276	$	65,435	$	341,872

	Nine Months Ended September 30, 2017
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	419,991	$	276,431	$	4,216	$	700,638
Time and materials	—		40,325		212,583		252,908
Product sales	30,905		36,625		—		67,530
License fees	444		—		—		444
Total revenues	$	451,340	$	353,381	$	216,799	$	1,021,520

Contract Asset and Liability

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

	September 30,    2018(1)			December 31,   2017(2)
Contract assets – current	$	88,348		$	75,371
Contract liabilities – current	(35,297		)	(51,597		)
Net contract assets	$	53,051		$	23,774

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⁽¹⁾  Amounts exclude contract assets of $2.2 million and contract liabilities of less than $0.1 million that were classified as held for sale at September 30, 2018 (see Note 5).

⁽²⁾  Amounts exclude contract assets of $1.3 million and contract liabilities of $5.5 million that were classified as held for sale at December 31, 2017 (see Note 5).