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Workers' Compensation (Worker's Compensation Expense) (Details) (Workers' Compensation [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Workers' Compensation [Member]
       
Accrued Workers' Compensation [Line Items]        
Service cost $ 363 $ 419 $ 1,373 $ 1,458
Interest cost 709 629 2,022 1,708
Net amortization 262    731 (574)
Curtailments 816    816 1,933
Total net benefit 2,150 1,048 4,942 4,525
Traumatic injury claims and assessments 4,114 7,453 16,263 19,052
Total workers’ compensation expense $ 6,264 $ 8,501 $ 21,205 $ 23,577