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Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2015
Jun. 28, 2015
Jun. 29, 2014
Mar. 31, 2013
Dec. 25, 2011
Jun. 28, 2015
Jun. 29, 2014
Nov. 02, 2011
Dec. 28, 2008
Loss Contingencies [Line Items]                  
Loss contingency accrual                 $ 5,700
Estimated litigation liability               $ 6,600  
Loss contingency accrual, provision         $ 900        
Litigation settlement   $ (8,980) $ 0 $ 6,600   $ (8,980) $ 0    
Loss contingency, damages sought           $ 65,000      
Settled Litigation | AIG Superior Court of New Jersey                  
Loss Contingencies [Line Items]                  
Litigation settlement $ 9,000