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Revenues (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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



	Year Ended December 31, 2018
	Infrastructure Solutions				Corrosion Protection				Energy Services				Total
Primary geographic region:
United States	$	430,187			$	200,397			$	335,707			$	966,291
Canada	62,292				71,320				—				133,612
Europe	54,567				12,227				—				66,794
Other foreign	57,075				109,796				—				166,871
Total revenues	$	604,121			$	393,740			$	335,707			$	1,333,568



	Year Ended December 31, 2017
	Infrastructure Solutions				Corrosion Protection				Energy Services				Total
Primary geographic region:
United States	$	437,944			$	299,643			$	290,726			$	1,028,313
Canada	60,675				79,059				—				139,734
Europe	58,520				13,319				—				71,839
Other foreign	55,015				64,118				—				119,133
Total revenues	$	612,154			$	456,139			$	290,726			$	1,359,019



	Year Ended December 31, 2016
	Infrastructure Solutions				Corrosion Protection				Energy Services				Total
Primary geographic region:
United States	$	425,990			$	249,690			$	248,900			$	924,580
Canada	47,587				81,704				—				129,291
Europe	45,046				15,192				—				60,238
Other foreign	52,928				54,883				—				107,811
Total revenues	$	571,551			$	401,469			$	248,900			$	1,221,920

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



	Year Ended December 31, 2018
	Infrastructure Solutions				Corrosion Protection				Energy Services				Total
Contract type:
Fixed fee	$	556,642			$	296,217			$	16,134			$	868,993
Time and materials	—				58,372				319,573				377,945
Product sales	45,030				39,151				—				84,181
License fees	2,449				—				—				2,449
Total revenues	$	604,121			$	393,740			$	335,707			$	1,333,568



	Year Ended December 31, 2017
	Infrastructure Solutions				Corrosion Protection				Energy Services				Total
Contract type:
Fixed fee	$	569,701			$	353,480			$	9,225			$	932,406
Time and materials	—				56,288				281,501				337,789
Product sales	41,878				46,371				—				88,249
License fees	575				—				—				575
Total revenues	$	612,154			$	456,139			$	290,726			$	1,359,019



	Year Ended December 31, 2016
	Infrastructure Solutions				Corrosion Protection				Energy Services				Total
Contract type:
Fixed fee	$	524,311			$	301,114			$	14,838			$	840,263
Time and materials	—				52,240				234,062				286,302
Product sales	47,232				48,115				—				95,347
License fees	8				—				—				8
Total revenues	$	571,551			$	401,469			$	248,900			$	1,221,920

Contract Asset and Liability

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



	December 31, 2018⁽¹⁾				December 31, 2017⁽²⁾
Contract assets – current	$	62,467			$	75,371
Contract liabilities – current ⁽³⁾	(32,339		)		(51,597		)
Net contract assets	$	30,128			$	23,774

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⁽¹⁾	Amounts exclude contract assets of $1.8 million and contract liabilities of less than $0.1 million that were classified as held for sale at December 31, 2018 (see Note 6).


⁽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 6).


⁽³⁾	Decrease primarily due to the timing of billing and advance deposits received on certain projects in the Company’s coating services operation in the Middle East.