Equity Incentive Plans (Options by Exercise Price) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Granted, Wtd. Avg. grant date fair value	$ 0.00	$ 6.81	$ 9.75
Exercise prices and related information of stock option outstanding
Options outstanding, Number outstanding	849
Options outstanding, Wtd. Avg. remaining contractual life	6 years 4 months 20 days
Options outstanding, Wtd. Avg. exercise price	$ 19.67
Options exercisable, Number exercisable	584
Options exercisable Wtd. Avg. Remaining Contractual Life	5 years 10 months 25 days
Options exercisable, Wtd. Avg. exercise price	$ 18.81
6.66 - 13.72
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	$ 6.66
Upper range limit, Exercise price	$ 13.72
Options outstanding, Number outstanding	27
Options outstanding, Wtd. Avg. remaining contractual life	1 year 7 months 21 days
Options outstanding, Wtd. Avg. exercise price	$ 9.06
Options exercisable, Number exercisable	27
Options exercisable Wtd. Avg. Remaining Contractual Life	1 year 7 months 21 days
Options exercisable, Wtd. Avg. exercise price	$ 9.06
14.44 - 22.26
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	$ 14.44
Upper range limit, Exercise price	$ 22.26
Options outstanding, Number outstanding	734
Options outstanding, Wtd. Avg. remaining contractual life	6 years 3 months 19 days
Options outstanding, Wtd. Avg. exercise price	$ 19.75
Options exercisable, Number exercisable	526
Options exercisable Wtd. Avg. Remaining Contractual Life	6 years 3 months 19 days
Options exercisable, Wtd. Avg. exercise price	$ 19.10
22.30 - 24.61
Exercise prices and related information of stock option outstanding
Lower range limit, Exercise price	$ 22.30
Upper range limit, Exercise price	$ 24.61
Options outstanding, Number outstanding	88
Options outstanding, Wtd. Avg. remaining contractual life	8 years 7 months 15 days
Options outstanding, Wtd. Avg. exercise price	$ 22.31
Options exercisable, Number exercisable	31
Options exercisable Wtd. Avg. Remaining Contractual Life	8 years 7 months 15 days
Options exercisable, Wtd. Avg. exercise price	$ 22.30