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Inventories, net (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2017 and 2016 were as follows (in thousands):
 
December 31,
 
2017
 
2016
 
 
 
 
Pipe and connectors, net of allowance of $20,064 and $2,108, respectively
$
33,620

 
$
102,360

Finished goods, net of allowance of $1,520 and $2,518, respectively
14,541

 
14,257

Work in progress
9,206

 
7,099

Raw materials, components and supplies
19,053

 
15,363

Total inventories, net
$
76,420

 
$
139,079