8. Income Taxes

The provision for income taxes differs from amounts computed by applying the U.S. federal tax rate of 35% to income before income taxes for the three months ended March 31, 2014 and 2013 due to the following (in thousands):


	2014					2013
Computed “expected” tax expense	$	38,056		35.0	%	$	31,680		35.0	%
Changes resulting from:
Foreign income tax differential		(4,408	)	(4.0	)		(3,633	)	(4.0	)
State taxes net of federal benefits		1,219		1.1			985		1.1
Foreign-sourced nontaxable income		(3,138	)	(2.9	)		(4,318	)	(4.8	)
Other		1,293		1.3			1,137		1.3

Provision for income taxes	$	33,022		30.5	%	$	25,851		28.6	%

At March 31, 2014 and December 31, 2013, other noncurrent liabilities included liabilities for unrecognized income tax benefits of $21.5 million and $21.6 million, respectively. During the three months ended March 31, 2014 and 2013 the Company recognized additional liabilities of $0.5 million and $0.4 million, respectively, and reversed prior year liabilities of $0.6 million during the three months ended March 31, 2014 primarily due to the statute of limitations expiring. During the three months ended March 31, 2014 and 2013, amounts recorded for accrued interest and penalties expense related to the unrecognized income tax benefits were not significant.

The Company files numerous consolidated and separate income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The statute of limitations for the Company’s U.S. federal income tax returns has expired for years prior to 2010. The statute of limitations for the Company’s U.K. income tax returns has expired for years prior to 2012. The statute of limitations has expired for years prior to 2010 for the Company’s Czech Republic income tax returns, 2010 for the Company’s Russian income tax returns, 2008 for the Company’s Mexican income tax returns, 2009 for the Company’s Brazilian income tax returns, 2008 for the Company’s Luxembourg income tax returns, 2009 for the Company’s New Zealand income tax returns, and 2013 for the Company’s Australian income tax returns.