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Labor Union Contracts (Details)
9 Months Ended 0 Months Ended
Sep. 30, 2013
Collective bargaining agreements that expired on October 6, 2012
Jul. 30, 2013
Collective bargaining agreements that expired on October 6, 2012
Employee
Jul. 30, 2013
Employees covered under collective bargaining agreements
Employee
Labor Union Contracts      
Number of employees covered under the agreement (employees)   12,000 12,000
Approximate percentage of employees who are members of bargaining units (as a percent) 53.00%    
Period of labor contract     4 years