Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Dec. 31, 2011
Income Taxes (Textual) [Abstract]          
Penalties or interest liability accrued $ 0   $ 0   $ 0
Penalties or interest expense $ 0 $ 0 $ 0 $ 0  
Effective tax rate 30.80% 32.20% 31.60% 31.90%