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Goodwill and Identified Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Goodwill
(in thousands)
 
Infrastructure
Solutions
 
Corrosion
Protection
 
Energy
Services
 
Total
Beginning balance at January 1, 2015
$
177,275

 
$
39,500

 
$
76,248

 
$
293,023

Additions to goodwill through acquisitions (1)
—

 
—

 
3,998

 
3,998

Foreign currency translation
(1,800
)
 
(729
)
 
—

 
(2,529
)
Balance at June 30, 2015
$
175,475

 
$
38,771

 
$
80,246

 
$
294,492

__________________________
(1) 
During the first and second quarters of 2015, the Company recorded goodwill of $3.6 million and $0.4 million, respectively, related to the acquisition of Schultz Mechanical Contractors, Inc. (see Note 1).
Schedule of Finite-Lived Intangible Assets
Identified Intangible Assets
(in thousands)
 
 
June 30, 2015
 
December 31, 2014
 
Weighted
Average
Useful
Lives
(Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
License agreements
5
 
$
3,902

 
$
(3,203
)
 
$
699

 
$
3,908

 
$
(3,131
)
 
$
777

Backlog
0
 
4,720

 
(4,720
)
 
—

 
4,731

 
(4,731
)
 
—

Leases
12
 
2,067

 
(692
)
 
1,375

 
2,067

 
(623
)
 
1,444

Trademarks (1)
15
 
22,509

 
(5,728
)
 
16,781

 
21,722

 
(5,199
)
 
16,523

Non-competes (1)
3
 
1,210

 
(890
)
 
320

 
1,140

 
(839
)
 
301

Customer relationships (1)
13
 
165,288

 
(37,015
)
 
128,273

 
163,386

 
(32,196
)
 
131,190

Patents and acquired technology
15
 
55,579

 
(22,545
)
 
33,034

 
54,090

 
(22,052
)
 
32,038

 
 
 
$
255,275

 
$
(74,793
)
 
$
180,482

 
$
251,044

 
$
(68,771
)
 
$
182,273


__________________________
(1) 
During the first quarter of 2015, the Company recorded customer relationships, trademarks and non-competes of $2.3 million, $0.7 million and $0.1 million, respectively, related to the acquisition of Schultz Mechanical Contractors, Inc. (see Note 1).
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
Estimated amortization expense by year is as follows (in thousands):
2015
 
$
13,002

2016
 
13,239

2017
 
13,244

2018
 
13,076

2019
 
12,933