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Accounting Policies (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Oct. 01, 2010
Sep. 30, 2010
Health Insurance Costs [Abstract]          
Number of days in advance of the beginning of a reporting quarter United establishes cash funding rates 90 days        
Required accumulated cash surplus $ 9,000,000   $ 9,000,000    
Required deposit equal to approximately one day of claims funding activity 3,500,000        
Amount which plan costs were less than the net premiums paid and owed 16,400,000        
Prepaid health insurance, current 7,400,000        
Premiums owed to United 3,500,000        
Workers' Compensation Costs [Abstract]          
Company's maximum economic burden for the first layer of claims per occurrence       1,000,000 1,000,000
Company's maximum aggregate economic burden for claims in excess of 1 million per policy year       5,000,000  
Reduction in accrued workers' compensation costs for changes in estimated losses 8,300,000 10,400,000      
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) 0.70% 0.70%      
Incurred but not paid workers compensation liabilities [Abstract]          
Beginning balance, January 1, 111,685,000 104,791,000      
Accrued claims 30,496,000 28,586,000      
Present value discount (748,000) (712,000)      
Paid claims (24,462,000) (23,133,000)      
Ending balance 116,971,000 109,532,000      
Current portion of accrued claims 50,317,000 46,069,000      
Long-term portion of accrued claims 66,654,000 63,463,000 64,536,000    
Ending balance 116,971,000 109,532,000      
Workers compensation administrative fees accrued 2,000,000        
Undiscounted accrued workers' compensation costs 127,500,000 121,700,000      
Time period incurred claims expected to be paid recorded as restricted cash 1 year        
Additional claim funds paid related to ACE Program 5,000,000        
Time period incurred claims expected to be paid, included in deposits, a long-term asset Greater than 1 year        
Return of excess claim funds related to ACE Program 0 2,500,000      
Restricted cash - worker's compensation 50,317,000   47,149,000    
Deposits workers compensation $ 75,112,000   $ 64,201,000    
Time period estimate of incurred claim costs to be paid included in short-term liabilities 1 year        
Time period incurred claims expected to be paid, included in long-term liabilities Greater than 1 year