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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2011
Income Taxes [Abstract] |
Components Of The Provision For Income Taxes |
|  | Year Ended December 31, |
(In thousands) |  | 2011 |  |  | 2010 |  |  | 2009 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 27,470 |  |  | $ | 34,255 |  |  | $ | 7,910 |
State |  |  | 9,796 |  |  |  | 6,896 |  |  |  | 3,605 |
|  |  | 37,266 |  |  |  | 41,151 |  |  |  | 11,515 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 39,934 |  |  |  | 6,695 |  |  |  | 9,752 |
State |  |  | 3,414 |  |  |  | 929 |  |  |  | 1,027 |
|  |  | 43,348 |  |  |  | 7,624 |  |  |  | 10,779 |
Total provision for income taxes |  | $ | 80,614 |  |  | $ | 48,775 |  |  | $ | 22,294 |
Schedule Of Effective Income Tax Reconciliation Of The U.S. Statutory Federal Income Tax Rates |
|  | Year Ended December 31, |
(In thousands) |  | 2011 |  |  | 2010 |  |  | 2009 |
Tax provision at statutory rate on income before income taxes |  | $ | 77,029 |  |  | $ | 43,549 |  |  | $ | 20,008 |
State income taxes, net of federal benefit |  |  | 7,480 |  |  |  | 5,002 |  |  |  | 2,359 |
Meals and entertainment disallowance |  |  | 721 |  |  |  | 616 |  |  |  | 521 |
Tax credits |  |  | (4,453 | ) |  |  | (744 | ) |  |  | (783 | )
Other, net |  |  | (163 | ) |  |  | 352 |  |  |  | 189 |
Total provision for income taxes |  | $ | 80,614 |  |  | $ | 48,775 |  |  | $ | 22,294 |
Schedule Of Deferred Tax Assets And Liabilities |
|  | December 31, |
(In thousands) |  | 2011 |  |  | 2010 |
Deferred tax assets: |  |  |  |  |  |  |  |
Claims and insurance reserves |  | $ | 33,424 |  |  | $ | 30,823 |
Allowance for doubtful accounts |  |  | 2,827 |  |  |  | 2,642 |
Accrued vacation |  |  | 9,339 |  |  |  | 8,332 |
Deferred compensation |  |  | 14,441 |  |  |  | 12,204 |
Other |  |  | 11,036 |  |  |  | 6,652 |
Total deferred tax assets |  |  | 71,067 |  |  |  | 60,653 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation |  |  | (174,353 | ) |  |  | (122,950 | )
Unrecognized revenue |  |  | (6,995 | ) |  |  | (6,084 | )
Employee benefits |  |  | (3,421 | ) |  |  | (2,544 | )
Other |  |  | (1,748 | ) |  |  | (1,177 | )
Total deferred tax liabilities |  |  | (186,517 | ) |  |  | (132,755 | )
Net deferred tax liability |  | $ | (115,450 | ) |  | $ | (72,102 | )
Schedule Of Net Deferred Tax Liability |
|  | December 31, |
(In thousands) |  | 2011 |  |  | 2010 |
Current deferred tax asset |  | $ | 19,466 |  |  | $ | 18,666 |
Noncurrent deferred tax liability |  |  | (134,916 | ) |  |  | (90,768 | )
Net deferred tax liability |  | $ | (115,450 | ) |  | $ | (72,102 | )

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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 -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 9 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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