Note 18. Income Taxes

Income before income taxes is as follows:


	Year ended December 31,
	2018		2017		2016
	(in thousands)
United States	$	52,172	$	40,752	$	8,880
Foreign		2,533		3,079		2,144
Income before income taxes	$	54,705	$	43,831	$	11,024

Provision for income taxes is as follows:


	Year ended December 31,
	2018		2017		2016
	(in thousands)
Current:
United States
Federal	$	41	$	430	$	—
State		112		32		49
Foreign		323		230		(217)
Total current		476		692		(168)
Deferred:
Federal		8,108		(82,048)		—
State		425		(1,698)		—
Foreign		(189)		(74)		191
Total deferred		8,344		(83,820)		191
Income tax provision (benefit)	$	8,820	$	(83,128)	$	23

Reconciliation of income taxes at the United States Federal statutory rate to the effective income tax rate is as follows:


	Year ended December 31,
	2018		2017		2016
	(in thousands)
Income taxes at the United States statutory rate	$	11,488	$	15,341	$	3,859
State income taxes		299		203		32
Unrecognized tax benefits		(345)		(285)		(615)
Effect of change in valuation allowance		(441)		(115,831)		(7,765)
Foreign income tax rate differentials		73		(312)		233
Unremitted earnings of foreign subsidiaries		—		(8,933)		305
Stock options		(715)		(10,342)		264
Credit expirations		—		—		3,565
Repatriation of foreign earnings		—		4,556		—
Recognition of equity NOL's		—		(1,165)		—
Rate change		160		42,531		—
Credit generation		(3,530)		(8,778)		—
Discrete items, net		972		31		—
Other, net		859		(144)		145
Income tax provision (benefit)	$	8,820	$	(83,128)	$	23

Significant components of long‑term deferred income taxes are as follows:


	Year ended December 31,
	2018		2017

	(in thousands)
Federal net operating loss carryforwards	$	42,397	$	56,646
State net operating loss carryforwards		1,387		1,586
Foreign net operating loss carryforwards		641		758
Federal tax credit carryforwards		16,200		14,312
State tax credit carryforwards		6,489		6,908
Unremitted earnings of foreign subsidiaries		—		(21)
Intangible assets		(29)		116
Property, plant and equipment		5,924		5,838
Accrued compensation		97		45
Inventories		3,713		3,798
Stock compensation		2,760		2,351
Warranty		1,090		980
Deferred revenue		1,004		187
Other		(2,899)		(3,220)
Deferred taxes, gross		78,774		90,284
Valuation allowance		(6,835)		(7,136)
Deferred taxes, net	$	71,939	$	83,148

Changes in tax rates and tax laws are accounted for in the period of enactment. Our deferred tax assets and liabilities are measured at the enacted tax rate expected to apply when these temporary differences are expected to be realized or settled. On December 22, 2017, the Tax Cuts and Jobs Act (“2017 Tax Act”) was signed into law and has resulted in significant changes to the U.S. corporate income tax system. The 2017 Tax Act eliminates the deferral of U.S. income tax on the historical un-repatriated earnings by imposing the Transition Toll Tax, which is a one-time mandatory deemed repatriation tax on undistributed foreign earnings. The Transition Toll Tax is assessed on the U.S. shareholder's share of the foreign corporation's accumulated foreign earnings that have not previously been taxed. Earnings in the form of cash and cash equivalents will be taxed at a rate of 15.5% and all other earnings will be taxed at a rate of 8.0%. During 2018, the provisional amount for the Toll tax was updated from $4.6 million in 2017 to $3.6 million in 2018 due to refinement of earnings and profits during 2018. We consider our accounting regarding the Transition Toll Tax to be complete. We accrued income tax liabilities of $0.3 million after utilization of foreign tax and research and development credits. The Transition Toll Tax will be paid over an eight-year period, starting in 2018, and will not accrue interest.

The 2017 Tax Act includes a federal statutory rate reduction from 35% to 21%, the elimination or reduction of certain domestic deductions and credits and limitations on the deductibility of interest expense and executive compensation. The 2017 Tax Act also transitions international taxation from a worldwide system to a modified territorial system and includes base erosion prevention measures on non-U.S. earnings, which has the effect of subjecting certain earnings of our foreign subsidiaries to U.S. taxation as global intangible low-taxed income (“GILTI”). The tax related to GILTI was $0.4 million for the year ended December 31, 2018. We are treating GILTI as a period cost.

At December 31, 2018, we had $71.9 million of deferred tax assets worldwide relating to net operating loss carryforwards, tax credit carryforwards and other temporary differences, which are available to reduce income taxes in future years. We have continued to maintain a $6.8 million valuation allowance in the U.S. against certain tax credits and state net operating losses due to the uncertainty of their realization based on long-term Company forecasts and the expiration dates on these attributes. If future operating results of the U.S. or these foreign jurisdictions significantly exceed expectations, it is reasonably possible that there could be a further reduction in the valuation allowance in the future. Further reduction of the valuation allowance, in whole or in part, would result in a non-cash income tax benefit during the period of reduction.

At December 31, 2018, we have federal and state net operating loss carryforwards of $226.3 million and foreign net operating loss carryforwards of $2.5 million expiring principally between 2019 and 2034.

We have research and development and other tax credit carryforwards of $22.7 million at December 31, 2018 that can be used to reduce future federal and state income tax liabilities. These tax credit carryforwards expire principally between 2019 and 2038.

We consider the undistributed earnings of our foreign subsidiaries as of December 31, 2018, to be indefinitely reinvested and, accordingly, no U.S. income taxes have been provided thereon. As of December 31, 2018, the amount of cash associated with indefinitely reinvested foreign earnings was approximately $4.9 million. We have not, nor do we anticipate the need to, repatriate funds to the United States to satisfy domestic liquidity needs arising in the ordinary course of business, including liquidity needs associated with our domestic debt service requirements.

We and our subsidiaries file income tax returns in the U.S. federal jurisdiction and various states and foreign jurisdictions. We and most foreign subsidiaries are subject to income tax examinations by tax authorities for all years dating back to 2011. Our policy is to recognize interest related to unrecognized tax benefits as interest expense and penalties as operating expenses. We believe that we have appropriate support for the income tax positions taken and to be taken on our tax returns and that our accruals for tax liabilities are adequate for all open years based on an assessment of many factors including past experience and interpretations of tax law applied to the facts of each matter.

At December 31, 2018, we had unrecognized tax benefits related to uncertain tax positions of approximately $9.1 million, of which approximately $8.4 million reduced the Company’s deferred tax assets and the offsetting valuation allowance and $0.7 million was recorded in other long-term liabilities. During the second quarter of 2018, the statute of limitations associated with a tax position previously taken by the Company expired. The related tax reserve of $0.3 million and accrued interest of $0.2 million that had been recorded were reversed during the twelve months ended December 31, 2018. We recognized a benefit of $0.3 million in interest and penalties related to unrecognized tax benefits for the year-ended December 31, 2018.

A reconciliation of the beginning and ending balance of unrecognized tax benefits are as follows:


		Year ended December 31,
	2018		2017		2016
	(in thousands)
Balance at beginning of year	$	9,105	$	6,844	$	7,671
(Decrease) / increase in unrecognized tax benefits as a result of tax positions taken during a prior period		(132)		81		76
Decreases in unrecognized tax benefits related to settlements with tax authorities		—		—		—
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitation		(543)		(511)		(903)
Increases in unrecognized tax benefits as a result of tax positions taken during the current period		697		2,691		—
Balance at end of year	$	9,127	$	9,105	$	6,844

Recorded as other long-term liability	$	676	$	1,109	$	1,462
Recorded as a decrease in deferred tax assets and offsetting valuation allowance		8,451		7,996		5,382
Balance at end of year	$	9,127	$	9,105	$	6,844

As of December 31, 2018 we had $0.7 million of unrecognized tax benefits which, if recognized would reduce the effective tax rate.