Equity Incentive Plans (Options Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2012	Dec. 31, 2013
Summary of the activity of stock option awards
Options outstanding, Beginning Balance , Shares	1,198
Options granted, shares	0
Options exercised, Shares	(318)
Options forfeited/canceled/expired, Shares	(31)
Options outstanding, Ending Balance , Shares	849	1,198
Options vested and expected to vest, Shares	831
Options exercisable, Shares				584
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 18.92
Options granted, Wtd. Avg. Exercise Price	$ 0.00
Options exercised, Wtd. Avg. Exercise Price	$ 17.04
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 21.52
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 19.67	$ 18.92
Options vested and expected to vest, Wtd. Average Exercise Price	$ 19.63
Options exercisable, Wtd. Avg. Exercise Price				$ 18.81
Options outstanding, Ending Balance, Wtd. Avg. Remaining Contractual Term	6 years 4 months 21 days	6 years 10 months 6 days
Options vested and expected to vest, Wtd. Avg Remaining Contractual Term	6 years 4 months 13 days
Options exercisable, Wtd. Avg. Remaining Contractual Term	5 years 10 months 24 days
Options outstanding, Beginning Balance, Average Intrinsic Value	$ 10,654	$ 11,090
Options vested and expected to vest, Aggregate Intrinsic Value	10,473
Options exercisable, Aggregate Intrinsic Value				7,842
Intrinsic value of options exercised	5,564	7,051	4,718
Fair value of shares vested	$ 1,679	$ 2,062	$ 2,358