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Inventories
9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories at September 30, 2016 and December 31, 2015 were as follows (in thousands):
 
September 30,
 
December 31,
 
2016
 
2015
Pipe and connectors
$
111,566

 
$
137,245

Finished goods
4,207

 
4,020

Work in progress
5,739

 
5,230

Raw materials, components and supplies
15,104

 
14,768

Total inventories
$
136,616

 
$
161,263