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Segment, Product and Geographic Information (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Entity Wide Revenue Major Customers Amount $ 338,043 $ 294,064 $ 337,111
Cmi and Affiliates [Member]
     
Entity Wide Revenue Major Customers Amount 251,974 258,156 335,595
Customer and Its Affiliates [Member]
     
Entity Wide Revenue Major Customers Amount $ 86,069 $ 35,908 $ 1,516