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Income Taxes (Tables)

12 Months Ended

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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Reconciliation of the beginning and ending balance of unrecognized tax benefits.

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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.

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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.

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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.

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