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Joint Venture - (Tables)
 9 Months Ended
Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Summary of financial data for joint venture
The following information summarizes financial data for this joint venture for the three and nine months ended September 30, 2015 and 2014, respectively:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Net sales
$
36,885

 
$
68,202

 
$
130,505

 
$
196,061

Cost of materials
31,339

 
56,446

 
110,734

 
162,849

Income (loss) before taxes
(3,117
)
 
5,921

 
(367
)
 
15,364

Net income (loss)
(2,920
)
 
4,426

 
(268
)
 
11,828