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Inventories
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories at March 31, 2017 and December 31, 2016 were as follows (in thousands):
 
March 31,
 
December 31,
 
2017
 
2016
Pipe and connectors
$
96,821

 
$
102,360

Finished goods
14,770

 
14,257

Work in progress
7,122

 
7,099

Raw materials, components and supplies
17,723

 
15,363

Total inventories
$
136,436

 
$
139,079