Share-Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Restricted stock units payable in Stock
Restricted stock units
Outstanding at the beginning of year, nonvested (in shares)	710
Grants in periods, number of shares	257
Vested in periods, number of shares	(107)
Forfeited RSU's, number of shares	(30)
Outstanding at the end of period, nonvested (in shares)	830
Outstanding at the beginning of year, weighted average grant date fair value	$ 29.94
Grants in periods, weighted average grant date fair value	$ 28.47
Vested in periods, weighted average grant date fair value	$ (42.53)
Forfeited RSU's, weighted average grant date fair value	$ (27.94)
Outstanding at the end of year, weighted average grant date fair value	$ 27.93
Restricted Stock Units Payable in Cash
Restricted stock units
Outstanding at the beginning of year, nonvested (in shares)	2,540
Grants in periods, number of shares	583
Vested in periods, number of shares	(595)
Forfeited RSU's, number of shares	(148)
Outstanding at the end of period, nonvested (in shares)	2,380
Outstanding at the beginning of year, weighted average grant date fair value	$ 20.79
Grants in periods, weighted average grant date fair value	$ 28.43
Vested in periods, weighted average grant date fair value	$ (15.99)
Forfeited RSU's, weighted average grant date fair value	$ (23.91)
Outstanding at the end of year, weighted average grant date fair value	$ 23.67