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Property, Plant and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Property, plant and equipment consist of the following (in thousands):
 
December 31,
 
2016
 
2015
Land
$
21,006

 
$
15,521

Building and leasehold improvements
31,713

 
31,530

Plant and transportation equipment
5,551

 
4,747

Cable-ships and submersibles
169,034

 
137,458

Equipment, furniture and fixtures, and software
101,421

 
50,171

Construction in progress
19,889

 
10,427

 
348,614

 
249,854

Less accumulated depreciation and amortization
62,156

 
35,388

 
$
286,458

 
$
214,466