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Goodwill and Identified Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Goodwill
The following table presents a reconciliation of the beginning and ending balances of the Company’s goodwill at January 1, 2017 and June 30, 2017 (in thousands):
 
Infrastructure
Solutions
 
Corrosion
Protection
 
Energy
Services
 
Total
Balance, January 1, 2017:
 
 
 
 
 
 
 
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

Foreign currency translation
2,147

 
236

 
—

 
2,383

Balance, June 30, 2017:
 
 
 
 
 
 
 
Goodwill, gross
244,996

 
74,111

 
80,246

 
399,353

Accumulated impairment losses
(16,069
)
 
(45,400
)
 
(33,527
)
 
(94,996
)
Goodwill, net
$
228,927

 
$
28,711

 
$
46,719

 
$
304,357

__________________________
(1) 
During the first six months of 2017, the Company recorded goodwill of $3.4 million related to the acquisition of Environmental Techniques (see Note 1).
Schedule of Identified Intangible Assets
Identified Intangible Assets
Identified intangible assets consisted of the following (in thousands):
 
 
 
June 30, 2017
 
December 31, 2016
 
Weighted
Average
Useful
Lives
(Years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
License agreements
9.9
 
$
4,467

 
$
(3,529
)
 
$
938

 
$
4,418

 
$
(3,438
)
 
$
980

Leases
10.5
 
2,065

 
(985
)
 
1,080

 
2,065

 
(912
)
 
1,153

Trademarks (1)
13.5
 
24,435

 
(8,735
)
 
15,700

 
24,185

 
(7,868
)
 
16,317

Non-competes
1.6
 
1,313

 
(1,111
)
 
202

 
1,308

 
(1,054
)
 
254

Customer relationships (1)
11.0
 
189,787

 
(60,036
)
 
129,751

 
187,554

 
(53,830
)
 
133,724

Patents and acquired technology
10.0
 
66,923

 
(25,730
)
 
41,193

 
66,222

 
(23,739
)
 
42,483

 
 
 
$
288,990

 
$
(100,126
)
 
$
188,864

 
$
285,752

 
$
(90,841
)
 
$
194,911


__________________________
(1) 
During the first six months of 2017, the Company recorded trademarks of $0.1 million and customer relationships of $1.7 million related to the acquisition of Environmental Techniques (see Note 1).
Schedule of Estimated Amortization Expense
Estimated amortization expense by year is as follows (in thousands):
2017
 
$
17,408

2018
 
17,343

2019
 
17,090

2020
 
16,976

2021
 
16,820