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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The following table presents a reconciliation of the beginning and ending balances of goodwill (in thousands):
 
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
(15
)
 
142

 
—

 
127

Balance, March 31, 2019:
 
 
 
 
 
 
 
Goodwill, gross
244,506

 
76,525

 
81,504

 
402,535

Accumulated impairment losses
(62,848
)
 
(45,400
)
 
(33,527
)
 
(141,775
)
Goodwill, net
$
181,658

 
$
31,125

 
$
47,977

 
$
260,760
Schedule of identified intangible assets
Intangible assets consisted of the following (in thousands):
 
March 31, 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
1.5
 
$
3,894

 
$
(3,751
)
 
$
143

 
$
3,894

 
$
(3,716
)
 
$
178

Leases
1.8
 
864

 
(711
)
 
153

 
864

 
(689
)
 
175

Trademarks
9.5
 
15,788

 
(6,416
)
 
9,372

 
15,751

 
(6,202
)
 
9,549

Non-competes
4.1
 
2,527

 
(1,296
)
 
1,231

 
2,529

 
(1,229
)
 
1,300

Customer relationships
8.6
 
159,592

 
(69,329
)
 
90,263

 
159,719

 
(66,753
)
 
92,966

Patents and acquired technology
5.6
 
38,582

 
(23,484
)
 
15,098

 
38,338

 
(22,810
)
 
15,528

Total intangible assets
 
 
$
221,247

 
$
(104,987
)
 
$
116,260

 
$
221,095

 
$
(101,399
)
 
$
119,696
Schedule of estimated amortization expense
Estimated amortization expense by year is as follows (in thousands):
2019
 
$
13,686

2020
 
13,624

2021
 
13,477

2022
 
13,398

2023
 
13,398