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Business Description, Basis of Presentation and Significant Accounting Policies Summary of Significant Accounting Policies - Warranties (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Product Warranty Accrual $ 366 $ 385 $ 467
Warranty accruals/additions 232 443  
Warranty Usage $ (251) $ (525)