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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
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, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 363,734 |  |  | $ | 248,172 |  |  | $ | 256,545 |
Foreign |  |  | 3,151 |  |  |  | 4,167 |  |  |  | 1,655 |
State |  |  | 38,987 |  |  |  | 23,224 |  |  |  | 28,490 |
|  |  | 405,872 |  |  |  | 275,563 |  |  |  | 286,690 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (15,912 | ) |  |  | 41,583 |  |  |  | 25,341 |
Foreign |  |  | 5,545 |  |  |  | — |  |  |  | — |
State |  |  | (302 | ) |  |  | 7,525 |  |  |  | 3,278 |
|  |  | (10,669 | ) |  |  | 49,108 |  |  |  | 28,619 |
Total |  | $ | 395,203 |  |  | $ | 324,671 |  |  | $ | 315,309 |
Components of Deferred Taxes | The components of deferred taxes are as follows (amounts in thousands):
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |
Deferred income tax assets: |  |  |  |  |  |  |  |
Self-insurance reserves |  | $ | 88,401 |  |  | $ | 84,915 |
Compensation accruals |  |  | 66,399 |  |  |  | 55,788 |
State and foreign net operating loss carryforwards and other state and foreign deferred tax assets |  |  | 62,541 |  |  |  | 60,521 |
Other currently non-deductible accrued liabilities |  |  | 17,213 |  |  |  | 16,739 |
Net pension liability—OCI only |  |  | 10,929 |  |  |  | 11,746 |
Doubtful accounts and other reserves |  |  | 29,616 |  |  |  | 18,428 |
Other combined items—OCI only |  |  | 457 |  |  |  | 2,615 |
|  |  | 275,556 |  |  |  | 250,752 |
Less: Valuation Allowance |  |  | (52,567 | ) |  |  | (52,764 | )
Net deferred income tax assets: |  |  | 222,989 |  |  |  | 197,988 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Depreciable and amortizable assets |  |  | (400,809 | ) |  |  | (362,674 | )
Other deferred tax liabilities |  |  | (2,960 | ) |  |  | (2,963 | )
Net deferred income tax liabilities |  | $ | (180,780 | ) |  | $ | (167,649 | )
Effective Tax Rates Calculation | The effective tax rates, as calculated by dividing the provision for income taxes by income before income taxes, were as follows for each of the years ended December 31, 2015, 2014 and 2013 (dollar amounts in thousands):
|  | 2015 |  |  | 2014 |  |  | 2013 |
Provision for income taxes |  | $ | 395,203 |  |  | $ | 324,671 |  |  | $ | 315,309 |
Income before income taxes |  |  | 1,145,901 |  |  |  | 929,667 |  |  |  | 869,332 |
Effective tax rate |  |  | 34.5 | % |  |  | 34.9 | % |  |  | 36.3 | %
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, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State taxes, net of federal income tax benefit |  |  | 2.3 | % |  |  | 2.3 | % |  |  | 2.5 | %
Divestiture gain |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.3 | %
Other items |  |  | -0.6 | % |  |  | 0.0 | % |  |  | 0.4 | %
Impact of income attributable to noncontrolling interests |  |  | -2.2 | % |  |  | -2.4 | % |  |  | -1.9 | %
Effective tax rate |  |  | 34.5 | % |  |  | 34.9 | % |  |  | 36.3 | %
Net Deferred Tax Assets and Liabilities | The net deferred tax assets and liabilities are comprised as follows (amounts in thousands):
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |
Current deferred taxes |  |  |  |  |  |  |  |
Assets |  | $ | 135,120 |  |  | $ | 115,870 |
Liabilities |  |  | — |  |  |  | (1,305 | )
Total deferred taxes-current |  |  | 135,120 |  |  |  | 114,565 |
Noncurrent deferred taxes |  |  |  |  |  |  |  |
Assets |  |  | 92,383 |  |  |  | 85,792 |
Liabilities |  |  | (408,283 | ) |  |  | (368,006 | )
Total deferred taxes-noncurrent |  |  | (315,900 | ) |  |  | (282,214 | )
Total deferred tax liabilities |  | $ | (180,780 | ) |  | $ | (167,649 | )
Reconciliation of Unrecognized Tax Benefits | The tabular reconciliation of unrecognized tax benefits for the years ended December 31, 2015, 2014 and 2013 is as follows (amounts in thousands).
|  | As of December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Balance at January 1, |  | $ | 2,402 |  |  | $ | 3,369 |  |  | $ | 6,824 |
Additions based on tax positions related to the current year |  |  | 50 |  |  |  | 50 |  |  |  | 50 |
Additions for tax positions of prior years |  |  | 111 |  |  |  | 195 |  |  |  | 283 |
Reductions for tax positions of prior years |  |  | (524 | ) |  |  | (1,212 | ) |  |  | (1,260 | )
Settlements |  |  | (57 | ) |  |  | — |  |  |  | (2,528 | )
Balance at December 31, |  | $ | 1,982 |  |  | $ | 2,402 |  |  | $ | 3,369 |

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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=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of 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 (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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