Share-Based Arrangements Compensation Arrangements by Share-based Payment Award (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 1,884	$ 2,870	$ 3,581	$ 4,655
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	417	360	1,071	1,034
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	1,357	2,381	2,297	3,285
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	0	48	0	179
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 110	$ 81	$ 213	$ 157