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Equity Incentive Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2012 | Jul. 20, 2012 performance_metrics | Sep. 30, 2012 Senior Employee and Director [Member] | Sep. 30, 2012 Share based compensation awards other than option [Member] | Sep. 30, 2012 Restricted Stock [Member] | Oct. 02, 2011 Restricted Stock [Member] | Jan. 01, 2012 Restricted Stock [Member] | Sep. 30, 2012 Restricted Stock [Member] Minimum [Member] | Sep. 30, 2012 Restricted Stock [Member] Maximum [Member] | Jul. 20, 2012 Restricted Stock [Member] Maximum [Member] | Sep. 30, 2012 Employee Stock Purchase Plan [Member] | Sep. 30, 2012 Stock Options [Member] | Oct. 02, 2011 Stock Options [Member] | Sep. 30, 2012 Performance Based Share [Member] | Sep. 30, 2012 Stock Incentive Plan [Member]
Equity Incentive Plans (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock available for the issuance of awards |  |  |  | 651,804 |  |  |  |  |  |  |  |  |  |  | 1,396,954
Retirement of common stock, shares | 57,457 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share based payment award options granted aggregate fair value | $ 0.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense |  |  |  |  | 3.2 | 2.6 |  |  |  |  |  | 1.9 | 2.2 |  |
Unrecognized compensation costs related to non vested stock option awards |  |  |  |  | 9.6 |  |  |  |  |  |  | 3.2 |  |  |
Expected weighted average period to recognize expense |  |  |  |  | 2 years 6 months |  |  |  |  |  |  | 2 years 4 months 24 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 315,000 |  | 315,000 |  |  |  |  |  |  |  |  |  |  | 205,000 |
Number of annual performance metrics |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Weighted Towards Earnings Per Share Performance |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Weighted Towards Capital Performance Targets |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Grant Date Fair Value of Equity Awards Issued During Period |  |  |  |  | $ 5.8 |  | $ 9.3 |  |  |  |  |  |  |  |
Discount on purchase of Common Stock for employee from the current market price |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 19,487 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Shares Authorized Under ESPP for Sale Offer to Eligible Employees |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |

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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 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 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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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