Stock Based Compensation (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Restricted stock units outstanding, vested and expected to vest
Restricted stock units vested and expected to vest, Number of Shares	75,443
Restricted stock units vested and expected to vest, Weighted Average Remaining Contractual Life (years)	1 year 2 months 27 days
Restricted stock units vested and expected to vest, Aggregate Intrinsic Value	$ 315
Restricted Stock Units [Member]
Restricted stock units outstanding, vested and expected to vest
Restricted stock units outstanding, Number of Shares	95,189
Restricted stock units outstanding, Weighted Average Remaining Contractual Life (years)	1 year 7 months 28 days
Restricted stock units outstanding, Aggregate Intrinsic Value	$ 397

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Share based compensation arrangement by share based payment award equity instruments other than options vested and expected to vest intrinsic value.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options vested and expected to vest number.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options vested and expected to vest weighted average remaining contractual term.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award other than options outstanding intrinsic value.

+ References

No definition available.

+ Details

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(i)-(ii)

-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)(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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(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.

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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