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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory    
Raw materials $ 121,780 $ 128,606
Work-in-progress 27,009 26,762
Finished goods 45,582 54,425
Total inventory $ 194,371 $ 209,793