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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 348,614 $ 249,854
Less accumulated depreciation and amortization 62,156 35,388
Property, plant and equipment, net 286,458 214,466
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 21,006 15,521
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 31,713 31,530
Plant and transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 5,551 4,747
Cable-ships and submersibles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 169,034 137,458
Equipment, furniture and fixtures, and software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 101,421 50,171
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 19,889 $ 10,427