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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
Income Taxes |
Schedule of components of the provision for income taxes |
|  | 2012 |  | 2011 |  | 2010 |
Current provision (benefit) |  |  |  |  |  |  |
Federal |  | $ | 27,524 |  | $ | 24,791 |  | $ | 18,491 |
State |  | 7,125 |  | 5,697 |  | 4,663 |
Foreign |  | 67 |  | 621 |  | 1,081 |
|  | $ | 34,716 |  | $ | 31,109 |  | $ | 24,235 |
Deferred provision (benefit) |  |  |  |  |  |  |
Federal |  | (451 | ) | 6,488 |  | (1,951 | )
State |  | (366 | ) | 849 |  | (189 | )
Foreign |  | (62 | ) | (122 | ) | (36 | )
|  | (879 | ) | 7,215 |  | (2,176 | )
Change in valuation allowance |  | — |  | (150 | ) | — |
Total |  | $ | 33,837 |  | $ | 38,174 |  | $ | 22,059 |
Schedule of reconciliation of income tax expense compared to the amount of income tax expense that would result by applying U.S. federal statutory income tax rate to pre-tax income |
|  | 2012 |  | 2011 |  | 2010 |
U.S. federal statutory income tax rate |  | 35.00 | % | 35.00 | % | 35.00 | %
State taxes, net of federal income tax impact |  | 4.87 | % | 4.33 | % | 4.52 | %
Foreign tax credit |  | (0.01 | )% | (0.52 | )% | (1.88 | )%
Canadian income tax |  | 0.01 | % | 0.52 | % | 1.88 | %
Domestic production activities deduction |  | (2.97 | )% | (2.79 | )% | (3.30 | )%
Other items |  | 0.45 | % | 2.92 | % | 3.40 | %
Effective tax rate on income before provision for income taxes excluding income attributable to noncontrolling interests |  | 37.35 | % | 39.46 | % | 39.62 | %
Impact of income from noncontrolling interests on effective tax rate |  | (0.61 | )% | — |  | — |
Effective tax rate on income before provision for income taxes and noncontrolling interests |  | 36.74 | % | 39.46 | % | 39.62 | %
Schedule of tax effect of temporary differences that give rise to deferred income taxes |
|  | 2012 |  | 2011 |
Deferred tax assets: |  |  |  |  |
Accrued workers compensation |  | $ | 4,973 |  | $ | 4,023 |
Insurance reserves |  | 1,114 |  | 2,657 |
Other accrued liabilities |  | 10,434 |  | 6,604 |
State income taxes |  | 1,537 |  | 1,605 |
Capital loss carryforward |  | 344 |  | 344 |
Foreign tax credit |  | 662 |  | 644 |
Valuation allowance |  | (344 | ) | (344 | )
Total deferred tax assets |  | 18,720 |  | 15,533 |
Deferred tax liabilities |  |  |  |  |
Depreciation and amortization |  | (26,661 | ) | (24,659 | )
Prepaid expenses and other |  | (1,600 | ) | (1,294 | )
Total deferred tax liabilities |  | (28,261 | ) | (25,953 | )
Total |  | $ | (9,541 | ) | $ | (10,420 | )

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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 components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + 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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