Employee Benefit Plan Obligations (Details 11)	12 Months Ended
Dec. 31, 2011
Percentage of Total Portfolio Market Value
Equity Securities, Single Securities	5.00%
Equity Securities, Maximum	70.00%
Equity Securities, Minimum	30.00%
Fixed income based, single security	5.00%
Fixed income based, Maximum	70.00%
Fixed income based, Minimum	20.00%
Cash and equivalents, Single securities	5.00%
Cash and equivalents, Maximum	5.00%
Cash and equivalents, Minimum	1.00%
Alternative Investments, Single securities	5.00%
Alternative Investments, Maximum	20.00%
Alternative Investments, Minimum	0.00%

Defined benefit plan target allocation percentage of assets alternative investment range minimum.

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- Definition

Defined benefit plan target allocation percentage of assets alternative investments.

+ References

No definition available.

+ Details

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Defined benefit plan target allocation percentage of assets alternative investments maximum.

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No definition available.

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- Definition

Defined benefit plan target allocation percentage of assets cash and cash equivalents.

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No definition available.

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Defined benefit plan target allocation percentage of assets cash and cash equivalents range maximum.

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No definition available.

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- Definition

Defined benefit plan target allocation percentage of assets cash and cash equivalents range minimum.

+ References

No definition available.

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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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Target allocation maximum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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Target allocation minimum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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Target allocation percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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Target allocation maximum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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Target allocation minimum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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