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1. Basis of Presentation and Use of Estimates Immaterial Errors Inventory Costing (Details) (Net Income [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
2008 [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount $ 600
2009 [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount 800
2010 [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount 700
2011 [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount 800
2012 [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount 1,300
Third Quarter 2013 [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount 300
September 2013 YTD [Member]
  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Quantifying Misstatement in Current Year Financial Statements, Amount $ 1,000