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Stock-Based Compensation (Narrative) (Details) (USD $) | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Employee Stock Purchase Plan [Member] | Sep. 30, 2013 2011 Executive Incentive Compensation Plan [Member] | Sep. 30, 2013 Stock Option Plan For Directors [Member] | Dec. 31, 2012 Stock Option Plan For Directors [Member] | Sep. 30, 2013 1992 Stock Plan [Member] | Sep. 30, 2013 Key Employees [Member] 2011 Executive Incentive Compensation Plan [Member] | Sep. 30, 2013 Key Executive Employees [Member] 2011 Executive Incentive Compensation Plan [Member] | Sep. 30, 2013 Deferred Stock [Member] | Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] 2011 Executive Incentive Compensation Plan [Member] | Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] 2011 Executive Incentive Compensation Plan [Member] item
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of price of common stock at which employees are able to acquire |  |  | 90.00% |  |  |  |  |  |  |  |  |  |
Shares available |  |  | 38,856 | 568,711 |  |  | 136,009 |  |  |  |  |  |
Number of awards authorized |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  | 0 | 0 | 0 |  | 169,550 |  |  |  |
Award expiration period |  |  |  |  | 10 years |  |  |  | 7 years |  |  |  |
Award vesting percentage |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Awards granted |  |  |  |  |  |  |  |  |  | 217,654 | 29,290 | 28,280 |
Deferred stock awards granted |  |  |  | 11,576 |  |  | 0 | 202,078 |  |  |  |  |
Minimum percentage of revenue growth required to earn deferred stock |  |  |  | 150.00% |  |  |  |  |  |  |  |  |
Number of non-employee directors to receive restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  | 7
Value of restricted stock units granted for each non-employee director |  |  |  |  |  |  |  |  |  |  |  | $ 40,000 |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year
Aggregate intrinsic value of options outstanding | 213,000 |  |  |  |  |  |  |  |  |  |  |  |
Net cash proceeds from exercise of stock options | 110,000 | 86,000 |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of all options exercised | 38,000 |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense before income taxes | 8,000 | 367,000 |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense after income taxes | 5,000 | 238,000 |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to deferred stock shares | 621,000 |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefits from exercise of stock options | $ 14,000 | $ 68,000 |  |  |  |  |  |  |  |  |  |  |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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 Reference 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The discount rate from market value on offering date that participants pay for 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(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(2)(c) -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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -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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