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Fair Value Measurements (Details 2) (Level 2, USD $)
In Thousands, unless otherwise specified
Jul. 01, 2014
Dec. 31, 2013
Carrying Amount
   
Carrying amount and Fair value of financial instruments    
Installment loans $ 873 $ 1,233
Fair Value
   
Carrying amount and Fair value of financial instruments    
Installment loans $ 1,025 $ 1,434