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Inventories, net (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at March 31, 2018 and December 31, 2017 were as follows (in thousands):
 
March 31,
 
December 31,
 
2018
 
2017
Pipe and connectors, net of allowance of $19,868 and $20,064, respectively
$
27,930

 
$
33,620

Finished goods, net of allowance of $1,517 and $1,520, respectively
15,016

 
14,541

Work in progress
9,179

 
9,206

Raw materials, components and supplies
20,382

 
19,053

Total inventories, net
$
72,507

 
$
76,420