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Earnings Per Share - Antidilutive Securities (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted EPS	226	273	219	264
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted EPS	1	8	1	4

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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