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Business Segments Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue, Major Customer [Line Items]      
Major customer, percentage revenue, net 10.00%    
Glencore [Member]
      
Revenue, Major Customer [Line Items]      
Major customer, Revenue, net $ 511,051 $ 552,299 $ 564,431
Southwire [Member]
      
Revenue, Major Customer [Line Items]      
Major customer, Revenue, net 312,102 346,311 373,505
RTA [Member]
      
Revenue, Major Customer [Line Items]      
Major customer, Revenue, net 223,353 0 0
BHP Billiton [Member]
      
Revenue, Major Customer [Line Items]      
Major customer, Revenue, net $ 191,445 $ 202,500 $ 239,157