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Debt (Convertible Notes and Interest Rate Swap Details) (Details 2) (USD $)
3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Dec. 28, 2012
Debt Instruments [Abstract]      
Convertible Subordinated Debt $ 0   $ 197,782,000
Debt Discount Percentage at Issuance 5.00%    
Debt Instrument, Interest Rate, Stated Percentage 2.25%    
Debt Instrument, Frequency of Periodic Payment semi-annually    
Debt Instrument, Maturity Date Jun. 15, 2013    
Debt Instrument, Face Amount 197,800,000    
Debt Instrument, Interest Rate During Period 8.50%    
Debt Redemption Date Feb. 20, 2013    
Derivative [Line Items]      
Interest expense 6,988,000 4,359,000  
Interest Rate Swap [Member]
     
Derivative [Line Items]      
Derivative Description Of Terms three-year $150 million interest rate swap, which amortizes $50 million per year and became effective on February 20, 2013    
Type of Hedge Cash flow    
Notional Amount 150,000,000    
Start Date Feb. 20, 2013    
End Date Feb. 22, 2016    
Pay Fixed Interest Rate 0.573%    
Current Receive Variable Interest Rate 0.023%    
Annual Notional Amortizing Amount 50,000,000    
Description Of Interest Rate Risk Exposure This swap was entered into in order to hedge against potential changes in cash flows on the outstanding Credit Facility borrowings which are also indexed to the one-month LIBOR rate.    
DescriptionOfInterestRateCashFlowHedgeAccountingMethod This swap is accounted for as a cash flow hedge.    
Gain (Loss) Recognized In Income Ineffective Portion 0 0  
Interest expense 60,000 0  
Interest Rate Swap [Member] | OtherLiabilitiesMember
     
Derivative [Line Items]      
Fair Value $ (626,000)