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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Provisions for Income Taxes

The provisions for income taxes are:

		2018				2017				2016
Current:
Federal		$	5,641			$	2,124			$	5,136
State			1,777				1,347				(122	)
Foreign			2,121				570				655
Deferred:
Federal			650				160				(1,345	)
State			(365	)			242				1,216
Foreign			(679	)			—				—
		$	9,145			$	4,443			$	5,540

Total Income Tax Expense Applying U.S. Federal Income Tax Rate

Total income tax expense differed from the amounts computed by applying the U.S. Federal income tax rate of 21.0% to income before income tax expense as a result of the following:

		2018				2017				2016
Computed tax expense at statutory federal rates		$	7,054			$	8,651			$	6,415
Increase (decrease) in taxes resulting from:
State taxes, net of federal income tax benefit			1,627				988				820
Domestic production deduction			—				(150	)			(1,272	)
Impact of the enactment of the Tax Cuts and Jobs Act (net)			1,089				(3,433	)			—
Income tax credits			(689	)			(431	)			(335	)
Foreign tax rate differential			(37	)			(1,503	)			(1,587	)
Subpart F income			14				3				14
(Gain) loss on equity investments			(61	)			62				123
Stock based compensation			277				262				208
Tax interest			—				(22	)			920
Other			(129	)			16				234
		$	9,145			$	4,443			$	5,540

Components of Income before Provision

Income before provision for income taxes and losses on equity investments are:

		2018				2017				2016
Domestic		$	26,124			$	18,931			$	12,513
Foreign			7,472				5,922				6,404
		$	33,596			$	24,853			$	18,917

Deferred Tax Assets and Liability

Temporary differences between the financial statement carrying amounts and tax bases of assets and liabilities that give rise to significant portions of the net deferred tax liability at December 31, 2018 and 2017 relate to the following:

		2018				2017
Deferred tax asset
Inventories		$	3,299			$	3,213
State income taxes			53				330
Program accrual			7,088				7,381
Vacation pay accrual			685				600
Accrued bonuses			1,246				1,073
Bad debt expense			294				12
Stock compensation			1,723				822
NOL carryforward			580				54
Tax credits			779				778
Other			266				381
Deferred tax asset		$	16,013			$	14,644
Deferred tax liability
Plant and equipment, principally due to differences in    depreciation and capitalized interest		$	30,269			$	29,986
Prepaid expenses			1,107				942
Deferred tax liability			31,376				30,928
Total net deferred tax liability		$	15,363			$	16,284

Gross Unrecognized Tax Liabilities

The following is a roll-forward of the Company’s total gross unrecognized tax liabilities, not including interest and penalties, for the years ended December 31, 2018 and 2017:

		2018				2017
Balance at beginning of year		$	2,118			$	1,893
Additions for tax positions related to the current year			128				77
Additions for tax positions related to the prior years			24				—
Additions for tax positions related to acquired businesses			—				1,766
Reduction for tax positions related to the prior years			(100	)			(1,618	)
Balance at end of year		$	2,170			$	2,118

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