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Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
Stock-Based Compensation [Abstract] |  |  |
Options, Outstanding, beginning of period | 209,914 |  |
Options, Exercised in Period | (4,775) |  |
Options, Forfeited in Period | (12,225) |  |
Options, Outstanding, end of period | 192,914 | 209,914 |
Options, Exercisable at Period End | 164,914 |  |
Weighted Average Exercise Price Per Share, Outstanding, | $ 28.43 |  |
Weighted Average Exercise Price Per Share, Exercised in Period | $ 20.72 |  |
Weighted Average Exercise Price Per Share, Forfeited in Period | $ 29.65 |  |
Weighted Average Exercise Price Per Share, Outstanding, | $ 28.54 | $ 28.43 |
Weighted Average Exercise Price Per Share, Exercisable at End of Period | $ 28.72 |  |
Weighted Average Remaining Contractual Term, Outstanding, | 5 years 8 months 12 days | 6 years 3 months 18 days |
Weighted Average Remaining Contractual Term, Granted in Period | 0 years |  |
Weighted Average Remaining Contractual Term, Exercised During Period | 0 years 9 months 18 days |  |
Weighted Average Remaining Contractual Term, Forfeited During Period | 5 years 2 months 12 days |  |
Weighted Average Remaining Contractual Term, Outstanding, | 5 years 8 months 12 days | 6 years 3 months 18 days |
Weighted Average Remaining Contractual Term, Exercisable at End of Period | 5 years |  |
Aggregate Intrinsic Value, Outstanding, | $ 113 |  |
Aggregate Intrinsic Value, Exercised in Period | 31 |  |
Aggregate Intrinsic Value, Outstanding, | 370 | 113 |
Aggregate Intrinsic Value, Exercisable at End of Period | 293 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ 33 |  |
Amortization Date of Unrecognized Compensation Cost, Related to Non-Vested Options Granted in 2011 | Dec. 31, 2012 |  |
Share Price | $ 30.20 | $ 27.47 | $ 24.02

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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 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 Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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 (d)(2) -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 c(2) -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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