Equity Plans Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Options, Outstanding [Roll Forward]
Outstanding Shares as of January 1, 2012	64,544
Exercised, shares	(13,330)
Outstanding Shares as of December 31, 2012	51,214	64,544
Options exercisable at December 31, 2012, shares	51,214
Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding as of January 1, 2012, wtd avg exercise price	$ 19.24
Exercised, wtd avg exercise price	$ 14.85
Outstanding as of December 31, 2012, wtd avg exercise price	$ 20.38	$ 19.24
Options exercisable at December 31, 2012, wtd avg exercise price	$ 20.38
Weighted average remaining contractual term of options outstanding	1 year 1 month 28 days	1 year 11 months 1 day
Options exercisable at December 31, 2012, wtd avg remaining contractual term	1 year 1 month 28 days
Options outstanding, intrinsic value	$ 482	$ 490
Option exercises in period, total intrinsic value	179	210	0
Options exercisable at December 31, 2012, intrinsic value	$ 482
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option award vesting period	4 years
Option award exercise period	10 years
Employee Stock Option [Member] | Annual [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual option vesting percentage	25.00%