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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% |  |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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