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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Estimated Useful Lives of Property and Equipment | Property and Equipment Property and equipment are recorded at cost and are depreciated over the estimated useful lives of the related assets using the straight-line method. The estimated useful lives of property and equipment for purposes of computing depreciation are as follows:
Buildings and improvements |  | 5-30 years
Computer hardware and software |  | 2-5 years
Software development costs |  | 3-5 years
Furniture, fixtures and other |  | 5-7 years
Activity and Balances Related to Incurred But Not Paid Worker's Compensation Claims | The following table provides the activity and balances related to incurred but not paid workers’ compensation claims:
|  | Year ended December 31,
|  | 2017 |  | 2016
|  | (in thousands)
Beginning balance |  | $ | 183,928 |  |  | $ | 162,184 |
Accrued claims |  | 68,194 |  |  | 65,069 |
Present value discount |  | (4,308 | ) |  | (2,628 | )
Paid claims |  | (40,184 | ) |  | (40,697 | )
Ending balance |  | $ | 207,630 |  |  | $ | 183,928 |
Current portion of accrued claims |  | $ | 41,137 |  |  | $ | 42,637 |
Long-term portion of accrued claims |  | 166,493 |  |  | 141,291 |
|  | $ | 207,630 |  |  | $ | 183,928 |

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- Definition Disclosure of accounting policy for depreciation, depletion, and amortization of property and equipment costs, including methods used and estimated useful lives and how impairment of such assets is assessed and recognized. + References No definition available. + Details
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