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Inventories, net (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2018 and 2017 were as follows (in thousands):
 
December 31,
 
2018
 
2017
 
 
 
 
Pipe and connectors, net of allowance of $21,270 and $20,064, respectively
$
18,026

 
$
33,620

Finished goods, net of allowance of $1,354 and $1,520, respectively
22,608

 
14,541

Work in progress
8,285

 
9,206

Raw materials, components and supplies
20,463

 
19,053

Total inventories, net
$
69,382

 
$
76,420