Stock-Based Compensation (Details 2) (Restricted stock units)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Restricted stock units
Restricted stock units
Restricted stock units at the beginning of the period (in shares)	657,825	727,317
Shares awarded	400,568	305,000
Shares vested	(294,856)	(181,666)
Shares forfeited	(6,667)	(60,000)
Restricted stock units at the end of the period (in shares)	756,870	790,651
Outstanding restricted shares vesting schedule
Outstanding restricted stock unit awards, vesting in 2012 (in shares)	55,493
Outstanding restricted stock unit awards, vesting in 2013 (in shares)	344,189
Outstanding restricted stock unit awards, vesting in 2014 (in shares)	235,188
Outstanding restricted stock unit awards, vesting in 2015 (in shares)	122,000

This element represents outstanding restricted stock unit awards which would vest within the current fiscal year.

No definition available.

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the year following the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the third year following the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

This element represents the number of outstanding restricted stock unit awards which will vest in the second year following the current fiscal year.

+ References

No definition available.

+ Details

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ 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 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.

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 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

+ Details

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Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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