Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense is composed of the following: 

	Year Ended December 31,
	2019		2018		2017
Current:
Federal	$	6,426	$	8,844	$	14,020
State	412		1,317		379
	6,838		10,161		14,399
Deferred:
Federal	352		55		(3,764)
State	(46)		1,480		300
	306		1,535		(3,464)
Total	$	7,144	$	11,696	$	10,935

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of income tax expense at the normal statutory federal rate to income tax expense included in the accompanying Consolidated Statements of Income is below:

	Year Ended December 31,
	2019			2018			2017
"Expected" provision at federal statutory rate	$	9,654		$	10,286		$	18,465
State income taxes, net(a)	1,540			2,029			1,612
Change in valuation allowance	(168)			1,304			(578)
Domestic production activity deduction	—			—			(957)
Share-based compensation(a)	(2,877)			(1,201)			(4,254)
Compensation limits	148			—			931
Federal and state tax credits	(1,302)			(807)			(1,058)
Tax benefit from the Tax Act	—			—			(3,343)
Other	149			85			117
Income tax expense	$	7,144		$	11,696		$	10,935
Effective tax rate	15.6		%	23.9		%	20.7		%

(a)The Company received federal excess tax benefits on share-based compensation awards in 2019, 2018, and 2017 of $2,877, $1,201, and $4,254, respectively, and state benefits of $459, $236 and $371, respectively, for excess tax benefits. The state benefits are part of the State income taxes, net, balances in the above table. Tax benefits from share-based compensation may be substantially less in future years, and in certain instances can create tax determinant.

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences giving rise to deferred income taxes shown on the Consolidated Balance Sheets are as follows:

	December 31,
	2019		2018
Deferred income tax assets:
Post-retirement liability	$	717	$	770
Deferred income	300		393
Share-based compensation	1,238		1,581
Capital loss carryforwards	91		379
State tax credit carryforwards	3,198		3,245
State operating loss carryforwards	1,529		1,505
Inventories	1,738		1,476
Operating lease liabilities	1,582		—
Other	1,291		1,231
Gross deferred income tax assets	11,684		10,580
Less: valuation allowance	(1,284)		(1,452)
Net deferred income tax assets	10,400		9,128
Deferred income tax liabilities:
Fixed assets	(10,332)		(10,497)
Operating lease right-of-use assets	(1,577)		—
Other	(420)		(308)
Gross deferred income tax liabilities	(12,329)		(10,805)
Net deferred income tax liability	$	(1,929)	$	(1,677)

Summary of Valuation Allowance

A schedule of the change in valuation allowance is as follows:

Balance at December 31, 2017	$	148
Increase	1,304
Balance at December 31, 2018	1,452
Decrease	(168)
Balance at December 31, 2019	$	1,284

Schedule of Unrecognized Tax Benefits Roll Forward

The following is a reconciliation of the total amount of unrecognized tax benefits (excluding interest and penalties) for 2019, 2018, and 2017:

	Year Ended December 31,
	2019		2018		2017
Beginning of year balance	$	193	$	185	$	43
Additions based on prior year tax positions	3		2		130
Additions based on current year tax positions	78		11		12
Reduction for prior year tax positions	(19)		(5)		—
End of year balance	$	255	$	193	$	185