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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at June 30, 2016 and December 31, 2015 were as follows (in thousands):
 
June 30,
 
December 31,
 
2016
 
2015
Pipe and connectors
$
119,818

 
$
137,245

Finished goods
4,245

 
4,020

Work in progress
5,955

 
5,230

Raw materials, components and supplies
15,168

 
14,768

Total inventories
$
145,186

 
$
161,263