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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The following table presents a reconciliation of the beginning and ending balances of the Company’s goodwill (in thousands):
 
Infrastructure
Solutions
 
Corrosion
Protection
 
Energy
Services
 
Total
Balance, December 31, 2017:
 
 
 
 
 
 
 
Goodwill, gross
$
246,486

 
$
74,369

 
$
80,246

 
$
401,101

Accumulated impairment losses
(61,459
)
 
(45,400
)
 
(33,527
)
 
(140,386
)
Goodwill, net
185,027

 
28,969

 
46,719

 
260,715

2018 Activity:
 
 
 
 
 
 
 
Acquisitions (1) (2)
—

 
2,715

 
1,258

 
3,973

Impairments (3)
(1,389
)
 
—

 
—

 
(1,389
)
Foreign currency translation
(1,363
)
 
(179
)
 
—

 
(1,542
)
Balance, September 30, 2018:
 
 
 
 
 
 
 
Goodwill, gross
245,123

 
76,905

 
81,504

 
403,532

Accumulated impairment losses
(62,848
)
 
(45,400
)
 
(33,527
)
 
(141,775
)
Goodwill, net
$
182,275

 
$
31,505

 
$
47,977

 
$
261,757

__________________________
(1) 
During the second quarter of 2018, the Company recorded goodwill of $2.7 million related to the acquisition of Hebna (see Note 1).
(2) 
During the third quarter of 2018, the Company recorded goodwill of $1.3 million related to the acquisition of P2S (see Note 1).
(3) 
During the third quarter of 2018, the Company recorded a $1.4 million goodwill impairment related to restructuring activities in Denmark (see Note 4).
Schedule of identified intangible assets
Intangible assets consisted of the following (in thousands):
 
September 30, 2018
 
December 31, 2017
 
Weighted
Average
Useful Lives
(Years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
License agreements (3)
1.8
 
$
3,899

 
$
(3,686
)
 
$
213

 
$
4,497

 
$
(3,623
)
 
$
874

Leases
2.3
 
796

 
(599
)
 
197

 
796

 
(534
)
 
262

Trademarks (2) (3)
9.6
 
15,739

 
(7,132
)
 
8,607

 
15,464

 
(6,184
)
 
9,280

Non-competes (1) (2)
4.8
 
2,548

 
(1,107
)
 
1,441

 
1,197

 
(1,048
)
 
149

Customer relationships (1) (2) (3)
9.2
 
161,745

 
(64,876
)
 
96,869

 
160,423

 
(56,907
)
 
103,516

Patents and acquired technology
6.1
 
38,699

 
(21,577
)
 
17,122

 
39,285

 
(21,021
)
 
18,264

 
 
 
$
223,426

 
$
(98,977
)
 
$
124,449

 
$
221,662

 
$
(89,317
)
 
$
132,345


__________________________
(1) 
During the second quarter of 2018, the Company recorded non-competes of $1.1 million and customer relationships of $1.3 million related to the acquisition of Hebna (see Note 1).
(2) 
During the third quarter of 2018, the Company recorded trademarks of $0.3 million, non-competes of $0.2 million and customer relationships of $0.7 million related to the acquisition of P2S (see Note 1).
(3) 
During the third quarter of 2018, the Company recorded intangible asset impairments related to restructuring activities in Denmark of $0.5 million for license agreements, $0.1 million for trademarks, and $0.3 million for customer relationships (see Note 4).
Schedule of estimated amortization expense
Estimated amortization expense by year is as follows (in thousands):
2018
 
$
13,848

2019
 
13,738

2020
 
13,691

2021
 
13,485

2022
 
13,287