Note 5. Income Taxes

The components of the provision for income taxes are as follows:



	Year Ended December 31,
(In thousands)	2013		2012		2011
Current:
Federal	$	74,202	$	74,074	$	27,470
State	15,635		11,890		9,796
	89,837		85,964		37,266
Deferred:
Federal	28,593		14,978		39,934
State	4,143		2,704		3,414
	32,736		17,682		43,348
Total provision for income taxes	$	122,573	$	103,646	$	80,614

The following is a reconciliation of the U.S. statutory federal income tax rates with our effective income tax rates for 2013, 2012 and 2011:



	Year Ended December 31,
(In thousands)	2013			2012			2011
Tax provision at statutory rate	$	115,040		$	95,584		$	77,029
State income taxes, net of federal benefit	12,083			10,211			7,480
Meals and entertainment disallowance	872			828			721
Tax credits	(5,422		)	(2,609		)	(4,453		)
Other, net	—			(368		)	(163		)
Total provision for income taxes	$	122,573		$	103,646		$	80,614

Deferred tax assets and liabilities consist of the following:



	December 31,
(In thousands)	2013			2012
Deferred tax assets:
Claims and insurance reserves	$	35,200		$	32,499
Allowance for doubtful accounts	1,595			2,829
Accrued vacation	14,873			12,399
Deferred compensation	22,067			17,734
Other	10,648			9,764
Total deferred tax assets	84,383			75,225
Valuation allowance	(460		)	(559		)
Net deferred tax assets	83,923			74,666

Deferred tax liabilities:
Depreciation and amortization	(239,971		)	(197,875		)
Unrecognized revenue	(8,169		)	(8,171		)
Other	(1,651		)	(1,752		)
Total deferred tax liabilities	(249,791		)	(207,798		)
Net deferred tax liability	$	(165,868	)	$	(133,132	)

Our net deferred tax liability consists of the following:



	December 31,
(In thousands)	2013			2012
Current deferred tax asset	$	23,249		$	20,054
Noncurrent deferred tax liability	(189,117		)	(153,186		)
Net deferred tax liability	$	(165,868	)	$	(133,132	)

As of December 31, 2013, the Company had various state tax credit carryforwards of approximately $3.8 million that are scheduled to expire in five to fifteen years. The Company recorded a valuation allowance in the amount of $460,000 and $559,000 as of December 31, 2013 and 2012, respectively, due to the uncertainty of realization of these tax credits.

We are subject to U.S. federal income tax, as well as income tax of multiple state tax jurisdictions. We remain open to examination by the Internal Revenue Service for tax years 2010 through 2013. We remain open to examination by various state tax jurisdictions for tax years 2009 through 2013.

Changes in our liability for unrecognized tax benefits could affect our effective tax rate, if recognized, but we do not expect any material changes within the next twelve months. The Company's liability for unrecognized tax benefits was immaterial as of December 31, 2013 and 2012. Interest and penalties related to uncertain tax positions, which are immaterial, are recorded in our Provision for Income Taxes on our Statements of Operations.