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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
Components of Income Taxes Expense (Benefit) | The components of income tax expense (benefit) are as follows:
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 36,818 |  |  | $ | 7,441 |  |  | $ | 22,522 |
State |  |  | 7,575 |  |  |  | 2,737 |  |  |  | 5,163 |
|  |  | 44,393 |  |  |  | 10,178 |  |  |  | 27,685 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (448 | ) |  |  | 18,125 |  |  |  | (2,956 | )
State |  |  | 32 |  |  |  | 2,679 |  |  |  | (2,480 | )
|  |  | (416 | ) |  |  | 20,804 |  |  |  | (5,436 | )
|  | $ | 43,977 |  |  | $ | 30,982 |  |  | $ | 22,249 |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of income tax computed at the U.S. statutory rate to the effective income tax rate is as follows:
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Statutory U.S. federal income tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State income taxes, net of federal tax benefit |  |  | 5.9 |  |  |  | 5.5 |  |  |  | 5.6 |
State tax credits, net of federal effect |  |  | (1.6 | ) |  |  | (1.2 | ) |  |  | (1.7 | )
Non deductible expenses |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.4 |
Other |  |  | (0.7 | ) |  |  | (1.5 | ) |  |  | (0.6 | )
Effective income tax rate |  |  | 38.8 | % |  |  | 38.0 | % |  |  | 38.7 | %
Significant Components of Deferred Income Tax Assets and Liabilities | Significant components of the Company’s deferred income tax assets and liabilities are as follows:
|  | As of December 31, |
|  | 2012 |  |  | 2011 |
Current deferred tax asset (liability): |  |  |  |  |  |  |  |
Accounts receivable allowance for doubtful accounts |  | $ | 3,321 |  |  | $ | 4,638 |
State taxes |  |  | (741 | ) |  |  | (764 | )
Estimated litigation loss and regulatory reserves |  |  | 1,588 |  |  |  | 76 |
Other |  |  | 1,313 |  |  |  | (597 | )
Current deferred tax asset |  |  | 5,481 |  |  |  | 3,353 |
Non-current deferred tax asset (liability): |  |  |  |  |  |  |  |
Depreciation and leases |  |  | (21,774 | ) |  |  | (18,763 | )
Share-based compensation |  |  | 8,294 |  |  |  | 6,664 |
Deferred rent |  |  | 2,642 |  |  |  | 2,353 |
Intangibles |  |  | 3,384 |  |  |  | 4,121 |
Other |  |  | 409 |  |  |  | 291 |
Non-current deferred tax (liability) asset |  |  | (7,045 | ) |  |  | (5,334 | )
Net deferred tax (liability) asset |  | $ | (1,564 | ) |  | $ | (1,981 | )
Reconciliation of Unrecognized Tax Benefits | The reconciliation of the beginning and ending balance of unrecognized tax benefits at December 31 is as follows:
|  | 2012 |  |  | 2011 |
Unrecognized tax benefits, beginning of year |  | $ | 845 |  |  | $ | 604 |
Tax positions taken during the current year |  |  |  |  |  |  |  |
Increases |  |  | — |  |  |  | — |
Decreases |  |  | — |  |  |  | — |
Tax positions taken during a prior year |  |  |  |  |  |  |  |
Increases |  |  | 214 |  |  |  | 1,628 |
Decreases |  |  | (5 | ) |  |  | (304 | )
Decreases for settlements during the period |  |  | (1,054 | ) |  |  | (937 | )
Reductions for lapses of applicable statute of limitations |  |  | — |  |  |  | (146 | )
Unrecognized tax benefits, end of year |  | $ | — |  |  | $ | 845 |

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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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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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