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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at June 30, 2017 and December 31, 2016 were as follows (in thousands):
 
June 30,
 
December 31,
 
2017
 
2016
Pipe and connectors
$
92,281

 
$
102,360

Finished goods
15,850

 
14,257

Work in progress
7,933

 
7,099

Raw materials, components and supplies
19,034

 
15,363

Total inventories
$
135,098

 
$
139,079