Note 4. Income Taxes

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



	Year Ended December 31,
(In thousands)	2014		2013		2012
Current:
Federal	$	123,598	$	74,202	$	74,074
State	15,858		15,635		11,890
	139,456		89,837		85,964
Deferred:
Federal	21,542		28,593		14,978
State	4,002		4,143		2,704
	25,544		32,736		17,682
Total provision for income taxes	$	165,000	$	122,573	$	103,646

The following is a reconciliation of income tax expense calculated using the U.S. statutory federal income tax rate with our income tax expense for 2014, 2013 and 2012:



	Year Ended December 31,
(In thousands)	2014			2013			2012
Tax provision at statutory rate	$	151,380		$	115,040		$	95,584
State income taxes, net of federal benefit	14,120			12,083			10,211
Meals and entertainment disallowance	959			872			828
Tax credits	(1,307		)	(5,422		)	(2,609		)
Other, net	(152		)	—			(368		)
Total provision for income taxes	$	165,000		$	122,573		$	103,646

Deferred tax assets and liabilities consist of the following:



	December 31,
(In thousands)	2014			2013
Deferred tax assets:
Claims and insurance reserves	$	36,690		$	35,200
Allowance for doubtful accounts	2,161			1,595
Accrued vacation	19,291			14,873
Deferred compensation	28,648			22,067
Other	12,924			10,648
Total deferred tax assets	99,714			84,383
Valuation allowance	(559		)	(460		)
Net deferred tax assets	99,155			83,923

Deferred tax liabilities:
Depreciation and amortization	(279,324		)	(239,971		)
Unrecognized revenue	(9,506		)	(8,169		)
Other	(1,737		)	(1,651		)
Total deferred tax liabilities	(290,567		)	(249,791		)
Net deferred tax liability	$	(191,412	)	$	(165,868	)

Our net deferred tax liability consists of the following:



	December 31,
(In thousands)	2014			2013
Current deferred tax asset	$	29,371		$	23,249
Noncurrent deferred tax liability	(220,783		)	(189,117		)
Net deferred tax liability	$	(191,412	)	$	(165,868	)

As of December 31, 2014, the Company had various state tax credit carryforwards of approximately $4.3 million that are scheduled to expire in five to fifteen years.

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 2011 through 2014. We remain open to examination by various state tax jurisdictions for tax years 2010 through 2014.

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, 2014 and 2013. Interest and penalties related to uncertain tax positions, which are immaterial, are recorded in our Provision for Income Taxes on our Statements of Operations.