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Goodwill and Identified Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and March 31, 2016 (in thousands):
 
Infrastructure
Solutions
 
Corrosion
Protection
 
Energy
Services
 
Total
Balance, January 1, 2016
 
 
 
 
 
 
 
Goodwill, gross
$
190,525

 
$
73,345

 
$
80,246

 
$
344,116

Accumulated impairment losses
(16,069
)
 
(45,400
)
 
(33,527
)
 
(94,996
)
Goodwill, net
174,456

 
27,945

 
46,719

 
249,120

Acquisitions (1)
43,621

 
—

 
—

 
43,621

Foreign currency translation
1,138

 
600

 
—

 
1,738

Balance, March 31, 2016
 
 
 
 
 
 
 
Goodwill, gross
235,284

 
73,945

 
80,246

 
389,475

Accumulated impairment losses
(16,069
)
 
(45,400
)
 
(33,527
)
 
(94,996
)
Goodwill, net
$
219,215

 
$
28,545

 
$
46,719

 
$
294,479

__________________________
(1) 
During the first quarter of 2016, the Company recorded goodwill of $43.6 million related to the acquisition of Underground Solutions (see Note 1).
Schedule of Identified Intangible Assets
Identified Intangible Assets
Identified intangible assets consisted of the following (in thousands):
(in thousands)
 
 
March 31, 2016
 
December 31, 2015
 
Weighted
Average
Useful
Lives
(Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
License agreements
4.1
 
$
3,898

 
$
(3,320
)
 
$
578

 
$
3,893

 
$
(3,275
)
 
$
618

Leases
11.3
 
2,065

 
(801
)
 
1,264

 
2,065

 
(764
)
 
1,301

Trademarks (1)
15.0
 
24,079

 
(6,649
)
 
17,430

 
22,519

 
(6,262
)
 
16,257

Non-competes
2.2
 
1,210

 
(972
)
 
238

 
1,210

 
(945
)
 
265

Customer relationships (1)
12.5
 
185,222

 
(44,779
)
 
140,443

 
164,779

 
(41,967
)
 
122,812

Patents and acquired technology (1)
13.7
 
68,492

 
(22,947
)
 
45,545

 
55,260

 
(22,395
)
 
32,865

 
 
 
$
284,966

 
$
(79,468
)
 
$
205,498

 
$
249,726

 
$
(75,608
)
 
$
174,118


__________________________
(1) 
During the first quarter of 2016, the Company recorded trademarks, customer relationships and acquired technology of $20.2 million, $1.5 million and $12.8 million, respectively, related to the acquisition of Underground Solutions (see Note 1).
Schedule of Estimated Amortization Expense
Estimated amortization expense by year is as follows (in thousands):
2016
 
$
16,544

2017
 
17,040

2018
 
16,937

2019
 
16,749

2020
 
16,715