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Commitments and Contingencies (Details 3)
 12 Months Ended
Dec. 31, 2013
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 6 years
Total employees | Employees covered by collective bargaining agreements
  
Collective Bargaining Agreements  
Percentage of employees covered by collective bargaining agreements 11.00%
Number of collective bargaining agreements that expire at various times over the next six years 40
Employees covered by collective bargaining agreements that expire during 2014 | Employees covered by collective bargaining agreements
  
Collective Bargaining Agreements  
Percentage of employees covered by collective bargaining agreements 2.20%
Number of collective bargaining agreements that expire within one year 14