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Accounting Policies (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
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 5,100      
Amount which plan costs were less than the net premiums paid and owed 24,500      
Prepaid health insurance, current 15,500      
Premiums owed to United 30,400      
Benefits costs incurred (reduced) related to run-off (1,100)      
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
Decrease Increase in accrued workers' compensation costs for changes in estimated losses $ 11,000 $ 9,100    
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) 1.50% 1.00%    
Incurred but not paid workers compensation liabilities [Abstract]        
Beginning balance, January 1, $ 183,928 $ 162,174    
Accrued claims 52,133 46,967    
Present value discount (3,048) (1,785)    
Paid claims (29,574) (29,537)    
Ending balance 203,439 177,819    
Current portion of accrued claims 41,748 41,778    
Long-term portion of accrued claims 161,691 136,041 141,291  
Workers compensation administrative fees accrued 2,300      
Undiscounted accrued workers' compensation costs $ 215,000 187,700    
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      
ReturnofExcessClaimFUndsNetofAdditionalAmountsPaidinClaimFundsforPriorPolicyYears $ 22,700 $ 12,800    
Restricted cash - worker's compensation 41,748   42,637  
Deposits workers compensation $ 142,821   $ 143,938  
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