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Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Health Insurance Costs [Abstract] |  |  |  |  |  |
Percentage of our health insurance coverage provided by United | 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 |  |  |
Required deposit equal to approximately one day of claims funding activity | 6,500 |  |  |  |  |
Amount which plan costs were less than the net premiums paid and owed | 36,800 |  |  |  |  |
Prepaid health insurance, current | 27,800 |  |  |  |  |
Premiums owed to United | 40,700 |  |  |  |  |
Benefits costs incurred (reduced) related to run-off | 1,500 | $ 300 |  |  |  |
Workers' Compensation Costs [Abstract] |  |  |  |  |  |
Company's maximum economic burden for the first layer of claims per occurrence | 1,000 |  |  | $ 1,500 |  |
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 | $ 10,100 | $ 7,800 |  |  |  |
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) | 1.00% | 2.50% |  |  |  |
Incurred but not paid workers compensation liabilities [Abstract] |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments |  |  | 242,904 |  | $ 229,639 |
Workers' Compensation Expense | $ 14,339 | $ 15,787 |  |  |  |
Present value discount | (200) | (1,689) |  |  |  |
Paid claims | (11,121) | (12,409) |  |  |  |
WorkersCompensationLiabilityNetOfAdminFeesCurrent | 48,289 | 44,704 |  |  |  |
Long-term portion of accrued claims | 197,633 | 186,624 | 193,609 |  |  |
Ending balance | 245,922 | 231,328 |  |  |  |
Workers compensation administrative fees accrued | 4,000 |  |  |  |  |
Undiscounted accrued workers' compensation costs | $ 265,600 | 250,200 |  |  |  |
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 | $ 48,349 |  | 49,295 |  | 42,227 | $ 44,705
Deposits workers compensation | $ 188,549 |  | 175,913 |  | $ 166,474 | $ 170,905
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 |  |  |  |  |
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Unbilled | $ 509,300 |  | $ 448,100 |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,229,483 | 1,153,010 |  |  |  |
Northeast [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 344,086 | 310,945 |  |  |  |
Southeast [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 140,678 | 129,906 |  |  |  |
Central [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 211,302 | 195,753 |  |  |  |
Southwest [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 272,130 | 269,832 |  |  |  |
West [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 246,853 | 233,204 |  |  |  |
Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 14,434 | $ 13,370 |  |  |  |

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