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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

X

- Definition

Number of restricted unit vest over next fiscal year.

+ References

No definition available.

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- Definition

Number of restricted unit would vest over vesting period.

+ References

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X

- Definition

Share based compensation arrangement by share based payment award award vesting percentage monthly.

+ References

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- Definition

Share based compensation arrangement by share based payment award award vesting percentage yearly.

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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.

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X

- 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



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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Definition

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Expected term of share-based compensation awards, 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

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

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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.

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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-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.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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