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Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
9. Property, Plant and Equipment, net

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



Depreciation expense was $28.9 million, $26.8 million and $9.8 million for the years ended December 31, 2016, 2015 and 2014, respectively. These amounts included $4.4 million, $7.9 million and $4.3 million of depreciation expense within cost of revenue for the years ended December 31, 2016, 2015 and 2014, respectively.

As of December 31, 2016 and 2015, total net book value of equipment under capital leases consisted of $51.0 million and $66.8 million of cable-ships and submersibles, respectively.