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Stock Based Compensation (Details Textual) (USD $) | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Options [Member] | Jun. 30, 2012 Options [Member] | Jun. 30, 2012 Options [Member] Maximum [Member] | Jun. 30, 2012 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member] Maximum [Member] | Jun. 30, 2012 Restricted Stock [Member] Minimum [Member] | Jun. 30, 2011 Stock Appreciation Rights (SARs) [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] Maximum [Member] | Jun. 30, 2012 Equity incentive plans [Member]
Stock-based compensation (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |  |  | 503,342
Total unrecognized compensation expense | $ 3,394,000 |  |  |  |  |  |  |  |  |  |  |
Vesting period | 2 years |  |  | 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 |  |  | 177,000 |  |  |  |  |  |  |  |  |
Number of restricted unit vest over next fiscal year | 34,000 |  |  |  |  |  |  |  |  |  |  |
Number of restricted unit would vest over vesting period | 20,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 20.00 |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 71,000 |  |  |

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- Definition The amount of expense, net of income tax, 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 No definition available. + Details
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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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