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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]  
Property, Plant and Equipment Useful Life
Buildings and improvements
15 to 50 years
Machinery and equipment
3 to 12 years
Computer software
3 to 10 years
Leasehold improvements
Shorter of useful life or lease term