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Shareholders' Equity (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Shareholders' Equity
Unrecognized compensation cost related to unvested share-based payment awards	$ 23,149
Period for recognition of unrecognized compensation cost related to unvested share-based payment awards (in years)	1.6
Unrecognized compensation cost expected to be recognized as compensation expense
2012	8,843
2013	7,036
2014	4,281
2015	2,047
2016	942
Total	$ 23,149

X

- Definition

Unrecognized compensation cost expected to be recognized in year five of the five succeeding years.

+ References

No definition available.

+ Details

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X

- Definition

Unrecognized compensation cost expected to be recognized in year four of the five succeeding years.

+ References

No definition available.

+ Details

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X

- Definition

Unrecognized compensation cost expected to be recognized in year one of the five succeeding years.

+ References

No definition available.

+ Details

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- Definition

Unrecognized compensation cost expected to be recognized in year three of the five succeeding years.

+ References

No definition available.

+ Details

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- Definition

Unrecognized compensation cost expected to be recognized in year two of the five succeeding years.

+ References

No definition available.

+ Details

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X

- 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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



Reference 2: 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

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

Reference 1: 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.



Reference 2: 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

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