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Contingencies (Details) - RPS Claim [Member]
$ in Thousands, $ in Thousands
Oct. 19, 2007
USD ($)
Oct. 19, 2007
MXN ($)
Aug. 07, 2007
USD ($)
Aug. 07, 2007
MXN ($)
Contingencies [Abstract]        
Contingent asset     $ 50 $ 845
Contingent liability $ 3,000 $ 50,681