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Fair Value Measurements (Reconciliation of Beginning and Ending Level 3 Net Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Fair Value Disclosures [Abstract]    
Balance beginning of period $ (4,926) $ (3,017)
Payments 0 64
Change in fair value (included within selling, general and administrative expenses) (55) 226
Balance end of period $ (4,981) $ (2,727)