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Equity Incentive Plans (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Jan. 01, 2012
Summary of the activity of stock option awards    
Options outstanding, Beginning Balance , Shares 1,601  
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price $ 19.44  
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term 6 years 6 months 4 days 6 years 8 months 23 days
Options outstanding, Beginning Balance, Average Intrinsic Value $ 2,778  
Options granted, Shares 96  
Options exercised, Shares 164  
Options exercised, Wtd. Avg. Exercise Price $ 11.27  
Options forfeited/canceled/expired, Shares 64  
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price $ 22.77  
Options outstanding, Ending Balance , Shares 1,469 1,601
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price $ 20.62 $ 19.44
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term 6 years 6 months 4 days 6 years 8 months 23 days
Options outstanding, Ending Balance, Average Intrinsic Value 10,200 2,778
Options exercisable at September 30, 2012, Shares 933  
Options exercisable at September 30, 2012, Wtd. Avg. Exercise Price $ 18.98  
Options exercisable at September 30, 2012, Wtd. Avg. Remaining Contractual Term 5 years 6 months 22 days  
Options exercisable at September 30, 2012, Aggregate Intrinsic Value $ 8,111  
Stock Options [Member]
    
Summary of the activity of stock option awards    
Options granted, Wtd. Avg. Exercise Price $ 25.78