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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2011
Income Taxes [Abstract] |
Components of Income Taxes Expense(Benefit) |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Year Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 7,441 |  |  | $ | 22,522 |  |  | $ | 16,587 |
State |  |  | 2,737 |  |  |  | 5,163 |  |  |  | 3,515 |
|  |  | 10,178 |  |  |  | 27,685 |  |  |  | 20,102 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 18,125 |  |  |  | (2,956 | ) |  |  | (1,498 | )
State |  |  | 2,679 |  |  |  | (2,480 | ) |  |  | (625 | )
|  |  | 20,804 |  |  |  | (5,436 | ) |  |  | (2,123 | )
|  | $ | 30,982 |  |  | $ | 22,249 |  |  | $ | 17,979 |
Schedule of Effective Income Tax Rate Reconciliation |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Year Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Statutory U.S. federal income tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State income taxes, net of federal tax benefit |  |  | 5.5 |  |  |  | 5.6 |  |  |  | 5.2 |
State tax credits, net of federal effect |  |  | (1.2 | ) |  |  | (1.7 | ) |  |  | (1.5 | )
Non deductible expenses |  |  | 0.2 |  |  |  | 0.4 |  |  |  | (0.1 | )
Other |  |  | (1.5 | ) |  |  | (0.6 | ) |  |  | 1.1 |
Effective income tax rate |  |  | 38.0 | % |  |  | 38.7 | % |  |  | 39.7 | %
Significant components of deferred income tax assets and liabilities |
|  |  | September 30, |  |  |  | September 30, |
|  | As of December 31, |
|  | 2011 |  |  | 2010 |
Current deferred tax asset (liability): |  |  |  |  |  |  |  |
Accounts receivable allowance for doubtful accounts |  | $ | 4,638 |  |  | $ | 14,713 |
State taxes |  |  | (764 | ) |  |  | (1,512 | )
Estimated litigation loss |  |  | 76 |  |  |  | 2,275 |
Other |  |  | (597 | ) |  |  | 602 |
Current deferred tax asset |  |  | 3,353 |  |  |  | 16,078 |
Non-current deferred tax asset (liability): |  |  |  |  |  |  |  |
Depreciation and leases |  |  | (18,763 | ) |  |  | (7,719 | )
Share-based compensation |  |  | 6,664 |  |  |  | 4,561 |
Deferred rent |  |  | 2,353 |  |  |  | 543 |
Intangibles |  |  | 4,121 |  |  |  | 4,977 |
Other |  |  | 291 |  |  |  | 438 |
Non-current deferred tax (liability) asset |  |  | (5,334 | ) |  |  | 2,800 |
Net deferred tax (liability) asset |  | $ | (1,981 | ) |  | $ | 18,878 |
Reconciliation of the beginning and ending balance of unrecognized tax benefits |
|  |  | September 30, |  |  |  | September 30, |
|  | 2011 |  |  | 2010 |
Unrecognized tax benefits, beginning of year |  | $ | 604 |  |  | $ | 1,066 |
Tax positions taken during the current year |  |  |  |  |  |  |  |
Increases |  |  | — |  |  |  | 34 |
Decreases |  |  | — |  |  |  | — |
Tax positions taken during a prior year |  |  |  |  |  |  |  |
Increases |  |  | 1,628 |  |  |  | 235 |
Decreases |  |  | (304 | ) |  |  | (505 | )
Decreases for settlements during the period |  |  | (937 | ) |  |  | (226 | )
Reductions for lapses of applicable statute of limitations |  |  | (146 | ) |  |  | — |
Unrecognized tax benefits, end of year |  | $ | 845 |  |  | $ | 604 |

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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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