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Commitments and Contingencies (Details 3) | 12 Months Ended
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Dec. 31, 2012 item
Environmental Contingencies |
Ownership interest in domestic subsidiaries (as a percent) | 100.00%
Employees covered by collective bargaining agreements |
Collective Bargaining Agreements |
Expiration period of collective bargaining agreements (in years) | 5
Total employees | Employees covered by collective bargaining agreements |
Collective Bargaining Agreements |
Percentage of employees covered by collective bargaining agreements | 11.00%
Employees covered by collective bargaining agreements that expire during 2012 | Employees covered by collective bargaining agreements |
Collective Bargaining Agreements |
Percentage of employees covered by collective bargaining agreements | 3.00%
Number of collective bargaining agreements that expire within one year | 16

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