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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Components of Income Tax Expense (Benefit) | Components of income tax expense/(benefit) are as follows (amounts in thousands):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 352,433 |  |  | $ | 368,957 |  |  | $ | 363,734 |
Foreign |  |  | 10,625 |  |  |  | 8,513 |  |  |  | 3,151 |
State |  |  | 37,421 |  |  |  | 42,166 |  |  |  | 38,987 |
|  |  | 400,479 |  |  |  | 419,636 |  |  |  | 405,872 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (36,998 | ) |  |  | (12,092 | ) |  |  | (15,912 | )
Foreign |  |  | 24 |  |  |  | 2,463 |  |  |  | 5,545 |
State |  |  | 192 |  |  |  | (820 | ) |  |  | (302 | )
|  |  | (36,782 | ) |  |  | (10,449 | ) |  |  | (10,669 | )
Total |  | $ | 363,697 |  |  | $ | 409,187 |  |  | $ | 395,203 |
Reconciliation Between Federal Statutory Rate and Effective Tax Rate | A reconciliation between the federal statutory rate and the effective tax rate is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State taxes, net of federal income tax benefit |  |  | 2.2 | % |  |  | 2.4 | % |  |  | 2.3 | %
Tax effects of foreign operations |  |  | -1.2 | % |  |  | -0.8 | % |  |  | -0.9 | %
Tax benefit from settlement of employee equity awards |  |  | -1.9 | % |  |  | 0.0 | % |  |  | 0.0 | %
Enactment of the TCJA-17 |  |  | -1.7 | % |  |  | 0.0 | % |  |  | 0.0 | %
Other items |  |  | 0.2 | % |  |  | 0.2 | % |  |  | 0.3 | %
Impact of income attributable to noncontrolling interests |  |  | -0.6 | % |  |  | -1.4 | % |  |  | -2.2 | %
Effective tax rate |  |  | 32.0 | % |  |  | 35.4 | % |  |  | 34.5 | %
Components of Deferred Taxes | The components of deferred taxes are as follows (amounts in thousands):
|  | Year Ended December 31, |
|  | 2017 |  |  |  | 2016 |
|  | Assets |  |  |  | Liabilities |  |  |  | Assets |  |  |  | Liabilities |
Self-insurance reserves | $ |  | 64,181 |  |  | $ |  |  |  |  | $ |  | 85,940 |  |  | $ |  |  |
Compensation accruals |  |  | 63,021 |  |  |  |  |  |  |  |  |  | 83,328 |  |  |  |  |  |
Doubtful accounts and other reserves |  |  | 20,809 |  |  |  |  |  |  |  |  |  | 38,017 |  |  |  |  |  |
Other currently non-deductible accrued liabilities |  |  | 19,759 |  |  |  |  |  |  |  |  |  | 24,058 |  |  |  |  |  |
Depreciable and amortizable assets |  |  |  |  |  |  |  | 226,389 |  |  |  |  |  |  |  |  |  | 332,326 |
State and foreign net operating loss carryforwards and other state and foreign deferred tax assets |  |  | 76,439 |  |  |  |  |  |  |  |  |  | 66,639 |  |  |  |  |  |
Net pension liabilities – OCI only |  |  | 2,825 |  |  |  |  |  |  |  |  |  | 5,926 |  |  |  |  |  |
Other combined items – OCI only |  |  |  |  |  |  |  | 550 |  |  |  |  | 815 |  |  |  |  |  |
Other liabilities |  |  |  |  |  |  |  | 1,824 |  |  |  |  |  |  |  |  |  | 2,949 |
| $ |  | 247,034 |  |  | $ |  | 228,763 |  |  | $ |  | 304,723 |  |  | $ |  | 335,275 |
Valuation Allowance |  |  | (70,227 | ) |  |  |  | 0 |  |  |  |  | (56,333 | ) |  |  |  | 0 |
Total deferred income taxes | $ |  | 176,807 |  |  | $ |  | 228,763 |  |  | $ |  | 248,390 |  |  | $ |  | 335,275 |
Reconciliation of Unrecognized Tax Benefits | The tabular reconciliation of unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015 is as follows (amounts in thousands).
|  | As of December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at January 1, |  | $ | 1,259 |  |  | $ | 1,982 |  |  | $ | 2,402 |
Additions based on tax positions related to the current year |  |  | 500 |  |  |  | 50 |  |  |  | 50 |
Additions for tax positions of prior years |  |  | 47 |  |  |  | 74 |  |  |  | 111 |
Reductions for tax positions of prior years |  |  | 0 |  |  |  | (94 | ) |  |  | (524 | )
Settlements |  |  | (710 | ) |  |  | (753 | ) |  |  | (57 | )
Balance at December 31, |  | $ | 1,096 |  |  | $ | 1,259 |  |  | $ | 1,982 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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