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Stock-Based Compensation (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 05, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation awards, options granted during period | 0 |  |
Share based compensation awards, options outstanding at period end (in Shares) | 283,258 |  |
Share based compensation awards, options outstanding and unvested at period end (in Shares) | 110,124 |  |
Shares purchased through Employee Stock Purchase Plan (in Shares) | 22,027 |  |
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share) | $ 11.43 |  |
Unrecognized share based compensation, expected term (in Duration) | 1 year 8 months 1 day |  |
Directors fees approved under new Directors Compensation Policy, audit committee chair |  |  | $ 17,500
Directors fees approved under new Directors Compensation Policy, compensation and corporate governance chair |  |  | 15,000
Directors fees approved under new Directors Compensation Policy, lead director |  |  | 115,000
Directors fees approved under new Directors Compensation Policy, each independent director |  |  | 40,000
Directors fees approved under new Directors Compensation Policy, each independent director per regular or scheduled meeting |  |  | 75,000
Directors fees approved under new Directors Compensation Policy, other committee members and chairs |  |  | 2,000
Directors fees approved under new Directors Compensation Policy |  |  | 1,600
Directors compensation expense | 133,000 | 161,000 |
Espp And Options [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation expense | 146,000 | 97,000 |
Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation expense | 313,000 | 240,000 |
Share based compensation awards, vesting percentage per period (in Percent) | 33.33% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Unrecognized share based compensation | 2,300,000 |  |
Performance Shares [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share based compensation expense | $ 169,000 |  |
Performance award hurdle price (in Dollars per share) | $ 21.50 |  |
Number of days market price must exceed limit to vest | 3 days |  |
Term when market price must exceed limit to vest | 30 days |  |
Performance award purchase price option 1 (in Dollars per share) | $ 0.50 |  |
Performance award purchase price option 2 (in Dollars per share) | $ 9 |  |

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- Definition Annual cash retainer approved to be paid to compensation and corporate governance committee chair. + References No definition available. + Details
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- Definition Annual cash retainer approved to be paid to each independent director, in quarterly installments. + References No definition available. + Details
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- Definition Annual cash retainer approved to be paid to each independent director for each regular or special meeting. + References No definition available. + Details
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- Definition Annual equity retainer approved to be paid to each independent director. To be paid in shares of entity common stock. + References No definition available. + Details
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- Definition Pre tax compensation expense related to director fees, annual retainers, and deferred compensation amortization. + References No definition available. + Details
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- Definition Annual cash retainer approved to be paid to lead director, in quarterly installments. + References No definition available. + Details
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- Definition Annual cash retainer approved to be paid to other committee members and chairment for each regular or special meeting. + References No definition available. + Details
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- Definition Weighted average purchase price of capital shares purchased through an employee stock purchase plan. + References No definition available. + Details
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- Definition The number of options outstanding and unvested as of the end of the period. + References No definition available. + Details
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- Definition The performance award exercise price, equal to the stock price plus this amount, applicable if that total is greater than $9. + References No definition available. + Details
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- Definition The performance award exercise price, applicable if equal to the stock price plus $.5 is less than or equal to $9. + References No definition available. + Details
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- Definition The stock price performance hurdle fair value assumption for equity-based awards granted. + References No definition available. + Details
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- Definition The vesting rate per period of share based compensation awards. + References No definition available. + Details
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- Definition Share-based Compensation, Equity Instruments Other than Options, Number of Days Market Price Must Exceed Limit to Vest + References No definition available. + Details
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- Definition Share-based Compensation, Equity Instruments Other than Options, Term when Market Price Must Exceed Limit to Vest + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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