Note 7 - Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of Goodwill [Table Text Block]

	Infrastructure Solutions			Corrosion Protection			Energy Services			Total
Balance, December 31, 2018
Goodwill, gross	$	244,521		$	76,383		$	81,504		$	402,408
Accumulated impairment losses		(62,848	)		(45,400	)		(33,527	)		(141,775	)
Goodwill, net		181,673			30,983			47,977			260,633
2019 Activity:
Foreign currency translation		(1,084	)		276			—			(808	)
Reclassification to assets held for sale (1)		(4,224	)		—			—			(4,224	)
Balance, September 30, 2019
Goodwill, gross		239,213			76,659			81,504			397,376
Accumulated impairment losses		(62,848	)		(45,400	)		(33,527	)		(141,775	)
Goodwill, net	$	176,365		$	31,259		$	47,977		$	255,601

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	September 30, 2019								December 31, 2018
	Weighted Average Useful Lives (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
License agreements	1.0	$	3,894	$	(3,801	)	$	93	$	3,894	$	(3,716	)	$	178
Leases	1.3		864		(755	)		109		864		(689	)		175
Trademarks	9.8		15,657		(6,699	)		8,958		15,751		(6,202	)		9,549
Non-competes	3.7		2,434		(1,422	)		1,012		2,529		(1,229	)		1,300
Customer relationships	7.8		157,342		(74,122	)		83,220		159,719		(66,753	)		92,966
Patents and acquired technology	8.0		38,660		(24,154	)		14,505		38,338		(22,810	)		15,528
Total intangible assets	—	$	218,850	$	(110,953	)	$	107,897	$	221,095	$	(101,399	)	$	119,696

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

2019	$	13,611
2020		13,518
2021		13,338
2022		13,338
2023		13,338