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Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 01, 2019 | 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 | 17,400 |  | 17,400 |  |  |  |
Prepaid health insurance, current | 8,400 |  | 8,400 |  |  |  |
Premiums owed to United | 27,600 |  | 27,600 |  |  |  |
Benefits costs incurred (reduced) related to run-off | (2,900) | $ 1,300 | (2,900) | $ 1,300 |  |  |
Workers' Compensation Costs [Abstract] |  |  |  |  |  |  |
Company's maximum economic burden for the first layer of claims per occurrence | 1,000 |  | 1,000 |  | $ 1,500 |  |
Company's maximum aggregate economic burden for claims in excess of 1 million per policy year | 6,000 |  | 6,000 |  | $ 6,000 |  |
Decrease Increase in accrued workers' compensation costs for changes in estimated losses |  |  | $ (26,000) | $ (13,400) |  |  |
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) |  |  | 2.00% | 2.50% |  |  |
Incurred but not paid workers compensation liabilities [Abstract] |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments |  |  |  |  |  | 229,639 | $ 207,630
Workers' Compensation Expense |  |  | $ 44,334 | $ 54,744 |  |  |
Present value discount |  |  | (3,664) | (5,372) |  |  |
Paid claims |  |  | (34,669) | (31,645) |  |  |
WorkersCompensationLiabilityNetOfAdminFeesCurrent | 45,250 | 42,258 | 45,250 | 42,258 |  |  |
Long-term portion of accrued claims | 190,390 | 183,099 | 190,390 | 183,099 |  | 187,412 |
Ending balance | 235,640 | 225,357 | 235,640 | 225,357 |  |  |
Workers compensation administrative fees accrued | 3,700 |  | 3,700 |  |  |  |
Undiscounted accrued workers' compensation costs |  |  | $ 255,300 | 241,300 |  |  |
Time period incurred claims expected to be paid recorded as restricted cash |  |  | 1 year |  |  |  |
Return Of Excess Claim Funds |  |  | $ 16,700 | 19,400 |  |  |
Time period incurred claims expected to be paid, included in deposits, a long-term asset |  |  | Greater than 1 year |  |  |  |
Restricted cash | 45,251 | 42,257 | $ 45,251 | 42,257 |  | 42,227 | 41,137
Deposits workers compensation | 170,032 | 152,268 | $ 170,032 | 152,268 |  | 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 |  |  |  |
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |  |
Unbilled | 474,200 |  | $ 474,200 |  |  | $ 385,600 |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,043,388 | 925,126 | 3,239,714 | 2,861,793 |  |  |
Northeast [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 271,839 | 237,076 | 853,263 | 748,717 |  |  |
Southeast [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 122,992 | 109,552 | 373,044 | 333,004 |  |  |
Central [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 180,602 | 155,184 | 555,797 | 476,277 |  |  |
Southwest [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 242,200 | 217,946 | 756,495 | 664,731 |  |  |
West [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 212,618 | 192,011 | 661,460 | 599,617 |  |  |
Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 13,137 | $ 13,357 | $ 39,655 | $ 39,447 |  |  |

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