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Stock-Based Compensation (Details Textual) (USD $) | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Options [Member] | Sep. 30, 2012 Options [Member] | Sep. 30, 2012 Options [Member] Maximum [Member] | Sep. 30, 2012 Restricted Stock [Member] | Sep. 30, 2012 Restricted Stock [Member] Maximum [Member] | Sep. 30, 2012 Restricted Stock [Member] Minimum [Member] | Sep. 30, 2012 Stock Appreciation Rights (SARs) [Member] | Sep. 30, 2012 Stock Appreciation Rights (SARs) [Member] Maximum [Member] | Sep. 30, 2012 Equity incentive plans [Member]
Stock-based compensation (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |  | 642,266
Total unrecognized compensation expense | $ 2,835,000 |  |  |  |  |  |  |  |  |  |
Vesting period | 1 year 10 months 24 days |  |  | 4 years | 3 years | 4 years | 3 years | 1 year | 3 years |  |
Term of years |  |  |  |  | 10 years |  |  |  |  | 10 years |
Percentage of vested grant date |  |  |  | 25.00% |  |  |  |  | 25.00% |  |
Percentage of vested grant date |  |  |  | 75.00% |  |  |  |  | 75.00% |  |
Estimated fair value |  |  | $ 140,000 |  |  |  |  |  |  |  |
Number of restricted unit vest over next fiscal year | 20,000 |  |  |  |  |  |  |  |  |  |
Number of restricted unit would vest over vesting period | 32,000 |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  | $ 20.00 |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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 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)(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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