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Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 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 4,500      
Amount which plan costs were less than the net premiums paid and owed 11,900      
Prepaid health insurance, current 2,900      
Premiums owed to United 19,900      
Benefits costs incurred related to run-off 1,700      
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
Decrease Increase in accrued workers' compensation costs for changes in estimated losses $ 3,900 $ 900    
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 $ 162,184    
Accrued claims 16,772 17,787    
Present value discount (968) (639)    
Paid claims (10,480) (8,719)    
Ending balance 189,252 170,613    
Current portion of accrued claims 42,458 40,282    
Long-term portion of accrued claims 146,794 130,331 141,291  
Workers compensation administrative fees accrued 1,800      
Undiscounted accrued workers' compensation costs $ 199,900 $ 180,800    
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 $ 42,458   42,637  
Deposits workers compensation $ 150,441   $ 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