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Fair Value (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
Major categories of assets and liabilities measured at fair value at June 30, 2015 and December 31, 2014 are classified as follows:
 
 
 
June 30, 2015
 
December 31, 2014
 
 
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Inventories
 
$
150,530
 
 
 
 
 
 
 
$
165,586
 
 
 
 
 
 
 
 
Aluminum futures contracts
 
$
7,346
 
 
 
 
 
 
 
 
9,769
 
 
 
 
 
 
 
 
Foreign currency forward contracts
 
$
159
 
 
 
 
 
 
 
 
1,337
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded conversion option
 
 
 
 
 
 
 
$
1,325
 
 
 
 
 
 
 
 
$
2,734