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Property, Plant and Equipment, net (Tables)
9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Property, plant and equipment consists of the following (in thousands):
 
 
September 30, 2018
 
December 31, 2017
Land
 
$
31,315

 
$
30,313

Building and leasehold improvements
 
39,828

 
34,632

Plant and transportation equipment
 
9,721

 
6,631

Cable-ships and submersibles
 
253,652

 
251,840

Equipment, furniture and fixtures, and software
 
143,056

 
127,409

Construction in progress
 
8,811

 
19,927

 
 
486,383

 
470,752

Less: Accumulated depreciation
 
116,612

 
96,092

Total
 
$
369,771

 
$
374,660