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Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Health Insurance Costs [Abstract]            
Percentage of our health insurance coverage provided by United 87.00%   87.00%      
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   $ 9,000  
Required deposit equal to approximately one day of claims funding activity 5,000   5,000      
Amount which plan costs were less than the net premiums paid and owed 16,400   16,400      
Prepaid health insurance, current 7,400   7,400      
Premiums owed to United 15,000   15,000      
Benefits costs incurred (reduced) related to run-off (3,500)   (3,500)      
Workers' Compensation Costs [Abstract]            
Company's maximum economic burden for the first layer of claims per occurrence 1,000   1,000      
Company's maximum aggregate economic burden for claims in excess of 1 million per policy year 6,000   6,000      
Decrease Increase in accrued workers' compensation costs for changes in estimated losses     $ 19,000 $ 10,900    
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths)     2.30% 2.50%    
Incurred but not paid workers compensation liabilities [Abstract]            
Workers' Compensation Expense     $ 27,299 $ 33,260    
Present value discount     (2,703) (3,360)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid     (22,727) (21,686)    
Ending balance 231,508 $ 215,844 231,508 215,844    
Long-term portion of accrued claims 188,241 174,017 188,241 174,017 187,412  
Workers compensation administrative fees accrued 3,900   3,900      
Undiscounted accrued workers' compensation costs     $ 250,900 230,400    
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 43,268 41,827 $ 43,268 41,827 42,227 $ 41,137
Deposits workers compensation 187,728 165,150 $ 187,728 165,150 166,474 154,215
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      
Unbilled 414,600   $ 414,600   385,600  
Disaggregation of Revenue [Line Items]            
WorkersCompensationLiabilityNetOfAdminFeesCurrent 43,267 41,827 43,267 41,827    
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments 231,508 215,844 231,508 215,844 $ 229,639 $ 207,630
Revenue from Contract with Customer, Excluding Assessed Tax 1,043,316 922,295 2,196,326 1,936,667    
Northeast [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 270,475 239,278 581,422 511,642    
Southeast [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 120,148 108,264 250,054 223,452    
Central [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 179,443 153,025 375,196 321,092    
Southwest [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 244,462 213,920 514,294 446,785    
West [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 215,639 194,986 448,842 407,605    
Other Revenues [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax $ 13,149 $ 12,822 $ 26,518 $ 26,091