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Commitments and Contingencies (Details 3) (Employees covered by collective bargaining agreements)	12 Months Ended
	Dec. 31, 2011 agreement
Collective Bargaining Agreements
Expiration period of collective bargaining agreements (in years)	5
Total employees
Collective Bargaining Agreements
Percentage of employees covered by collective bargaining agreements	12.00%
Employees covered by collective bargaining agreements that expire during 2012
Collective Bargaining Agreements
Percentage of employees covered by collective bargaining agreements	6.00%
Number of collective bargaining agreements that expire within one year	19

X

- Definition

Represents the expiration period of collective bargaining agreements.

+ References

No definition available.

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- Definition

Represents the number of collective bargaining agreements that expire within one year.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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