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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Current provision (benefit) |  |  |  |
Federal | $ 27,524 | $ 24,791 | $ 18,491 |
State | 7,125 | 5,697 | 4,663 |
Foreign | 67 | 621 | 1,081 |
Total | 34,716 | 31,109 | 24,235 |
Deferred provision (benefit) |  |  |  |
Federal | (451) | 6,488 | (1,951) |
State | (366) | 849 | (189) |
Foreign | (62) | (122) | (36) |
Total | (879) | 7,215 | (2,176) |
Change in valuation allowance |  | 150 |  |
Total | 33,837 | 38,174 | 22,059 |
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 |  |  |  |
U.S. federal statutory income tax rate (as a percent) | 35.00% | 35.00% | 35.00% |
State taxes, net of federal income tax impact (as a percent) | 4.87% | 4.33% | 4.52% |
Foreign tax credit (as a percent) | (0.01%) | (0.52%) | (1.88%) |
Canadian income tax (as a percent) | 0.01% | 0.52% | 1.88% |
Domestic production activities deduction (as a percent) | (2.97%) | (2.79%) | (3.30%) |
Other items (as a percent) | 0.45% | 2.92% | 3.40% |
Effective tax rate on income before provision for income taxes excluding income attributable to noncontrolling interests (as a percent) | 37.35% | 39.46% | 39.62% |
Impact of income from noncontrolling interests on effective tax rate (as a percent) | (0.61%) |  |  |
Effective tax rate on income before provision for income taxes and noncontrolling interests (as a percent) | 36.74% | 39.46% | 39.62% |
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) |  | (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) |  |
Minimum period of statute of limitations of state and foreign jurisdictions | 3 years |  |  |
Maximum period of statute of limitations of state and foreign jurisdictions | 5 years |  |  |

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