Note 7 - Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 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		(17	)		381			—			364
Reclassification to assets held for sale (1)		(4,224	)		—			—			(4,224	)
Balance, June 30, 2019
Goodwill, gross		240,280			76,764			81,504			398,548
Accumulated impairment losses		(62,848	)		(45,400	)		(33,527	)		(141,775	)
Goodwill, net	$	177,432		$	31,364		$	47,977		$	256,773

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

	June 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	2.5	$	3,894	$	(3,778	)	$	116	$	3,894	$	(3,716	)	$	178
Leases	1.5		864		(733	)		131		864		(689	)		175
Trademarks	10.5		15,673		(6,557	)		9,116		15,751		(6,202	)		9,549
Non-competes	3.9		2,537		(1,364	)		1,173		2,529		(1,229	)		1,300
Customer relationships	8		157,803		(71,589	)		86,214		159,719		(66,753	)		92,966
Patents and acquired technology	8.3		38,886		(23,941	)		14,945		38,338		(22,810	)		15,528
Total intangible assets	—	$	219,657	$	(107,962	)	$	111,695	$	221,095	$	(101,399	)	$	119,696

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

2019	$	13,747
2020		13,631
2021		13,451
2022		13,406
2023		13,406