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Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Oct. 01, 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   $ 9,000  
Required deposit equal to approximately one day of claims funding activity 3,500      
Amount which plan costs were less than the net premiums paid and owed 8,200      
Accrued health insurance, current (800)      
Premiums owed to United 2,900      
Benefits costs incurred related to run-off $ 2,400 $ 700    
Workers' Compensation Costs [Abstract]        
Company's maximum economic burden for the first layer of claims per occurrence       $ 1,000
Company's maximum aggregate economic burden for claims in excess of 1 million per policy year       $ 5,000
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) 1.00% 1.00%    
Incurred but not paid workers compensation liabilities [Abstract]        
Beginning balance, January 1, $ 162,184 $ 136,088    
Accrued claims 17,787 15,958    
Present value discount (639) (570)    
Paid claims (8,719) (10,549)    
Ending balance 170,613 140,927    
Current portion of accrued claims 40,282 45,152    
Long-term portion of accrued claims 130,331 95,775 124,746  
Workers compensation administrative fees accrued 1,900      
Undiscounted accrued workers' compensation costs $ 180,800 $ 150,600    
Time period incurred claims expected to be paid recorded as restricted cash 1 year      
Time period incurred claims expected to be paid, included in deposits, a long-term asset Greater than 1 year      
Restricted cash - worker's compensation $ 40,281   37,418  
Deposits workers compensation $ 139,873   $ 136,462  
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