The significant differences between the statutory federal tax rate and the effective income tax rates for the Company for the respective years shown below were as follows:



	2018			2017			2016
Statutory U.S. federal income tax rate	24.5	%	**	35.0	%		35.0	%
Foreign rate differential	—	%		(1.1	)%		0.3	%
State income tax, net of federal benefit	4.1	%		4.0	%		6.1	%
Tax credit	(0.7	)%		(0.9	)%		(3.2	)%
Deferred tax asset valuation allowance	0.6	%		(0.3	)%		0.8	%
Uncertain tax positions, net of settlements	2.2	%		0.9	%		1.4	%
Goodwill impairment	—	%		—	%		6.6	%
Section 199 manufacturer's deduction	(2.2	)%		(2.8	)%		(4.2	)%
Taxes related to foreign income, net of credits	0.1	%		(8.7	)%	*	0.5	%
Compensation	1.5	%		—	%		—	%
Tax rate or law change	12.3	%		—	%		—	%
Other	(2.1	)%		1.0	%		(0.4	)%
	40.3	%		27.1	%		42.9	%

* Rate benefit is primarily from excess foreign tax credits generated by a dividend repatriation in the first quarter of fiscal 2017.

** The federal statutory rate is a blended rate which reflects 35.0% through December 31, 2017 and the lower rate of 21.0% beginning on January 1, 2018 due to tax reform.

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