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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents a reconciliation of the beginning and ending balances of goodwill (in millions):
 
Infrastructure
Solutions
 
Corrosion
Protection
 
Energy
Services
 
Total
Balance, December 31, 2016
 
 
 
 
 
 
 
Goodwill, gross
$
239,494

 
$
73,875

 
$
80,246

 
$
393,615

Accumulated impairment losses
(16,069
)
 
(45,400
)
 
(33,527
)
 
(94,996
)
Goodwill, net
223,425

 
28,475

 
46,719

 
298,619

2017 Activity:
 
 
 
 
 
 
 
Acquisitions (1)
3,355

 
—

 
—

 
3,355

Impairments (2)
(45,390
)
 
—

 
—

 
(45,390
)
Foreign currency translation
3,637

 
494

 
—

 
4,131

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 (3)
—

 
2,715

 
1,258

 
3,973

Impairments (4)
(1,389
)
 
—

 
—

 
(1,389
)
Foreign currency translation
(1,965
)
 
(701
)
 
—

 
(2,666
)
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

__________________________
(1) 
During 2017, the Company recorded goodwill of $3.4 million related to the acquisition of Environmental Techniques (see Note 1).
(2) 
During 2017, the Company recorded a $45.4 million goodwill impairment to its Fyfe reporting unit (see Note 2).
Schedule of Finite-Lived Intangible Assets
Intangible assets consisted of the following (in thousands):
 
December 31, 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)
1.6
 
$
3,894

 
$
(3,716
)
 
$
178

 
$
4,497

 
$
(3,623
)
 
$
874

Leases
2.0
 
864

 
(689
)
 
175

 
796

 
(534
)
 
262

Trademarks (2)(3)
9.8
 
15,751

 
(6,202
)
 
9,549

 
15,464

 
(6,184
)
 
9,280

Non-competes (1)(2)
4.3
 
2,529

 
(1,229
)
 
1,300

 
1,197

 
(1,048
)
 
149

Customer relationships (1)(2)(3)
8.9
 
159,719

 
(66,753
)
 
92,966

 
160,423

 
(56,907
)
 
103,516

Patents and acquired technology
5.6
 
38,338

 
(22,810
)
 
15,528

 
39,285

 
(21,021
)
 
18,264

 
 
 
$
221,095

 
$
(101,399
)
 
$
119,696

 
$
221,662

 
$
(89,317
)
 
$
132,345

__________________________
(1) 
During 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 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 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 Finite-Lived Intangible Assets, Future Amortization Expense
Estimated amortization expense by year is as follows (in thousands):
Year
 
Amount
2019
 
$
13,641

2020
 
13,603

2021
 
13,400

2022
 
13,400

2023
 
13,270