Income Taxes

The following is a geographical breakdown of income before the provision for income taxes:



	Year Ended
	December 31, 2015			December 31, 2014		December 31, 2013
	(In thousands)
Domestic	$	51,089		$	48,327	$	34,678
Foreign	(4,845		)	177		351
Income before provision for income taxes	$	46,244		$	48,504	$	35,029

The provision for income taxes consists of the following:



	Year Ended
	December 31, 2015			December 31, 2014			December 31, 2013
	(In thousands)
Current:
Federal	$	13,840		$	14,063		$	8,218
State	2,475			2,274			1,621
Foreign	203			192			447
Total current income taxes	16,518			16,529			10,286
Deferred:
Federal	846			1,603			1,287
State	(379		)	84			(263		)
Foreign	(1,501		)	(230		)	(260		)
Total deferred income taxes	(1,034		)	1,457			764
Total provision for income taxes	$	15,484		$	17,986		$	11,050

The provision for income taxes differs from the amount computed by applying the statutory federal tax rate as follows:



	Year Ended
	December 31, 2015			December 31, 2014			December 31, 2013
	(In thousands)
U.S. federal tax provision at statutory rate	$	16,181		$	16,998		$	12,260
State taxes	1,365			1,533			883
Non-deductible expenses	551			809			297
Acquisition costs	239			229			—
Share-based compensation expense	748			461			407
Research tax credits	(1,324		)	(818		)	(1,430		)
Domestic production deduction	(1,133		)	(1,127		)	(816		)
Gain on investment	(1,205		)	—			—
Other	62			(99		)	(551		)
Total provision for income taxes	$	15,484		$	17,986		$	11,050

Significant components of the Company's deferred tax assets (liabilities) are as follows:



	December 31, 2015			December 31, 2014
	(In thousands)
Deferred tax assets (liabilities):
Deferred revenue	$	14,020		$	12,639
Stock compensation	6,034			6,287
Inventory related items	2,541			2,713
Tax credit carry forwards	2,579			2,168
Reserves and accruals	—			327
Loss carry forwards	667			12
Other, net	697			—
Total net deferred tax assets	26,538			24,146

Intangibles	(28,213		)	(26,485		)
Depreciation and amortization	(17,185		)	(14,331		)
Reserves and accruals	(601		)	—
Other, net	—			(194		)
Total deferred tax liabilities	(45,999		)	(41,010		)

Net deferred tax liabilities	$	(19,461	)	$	(16,864	)

Deferred income tax assets (liabilities) are provided for temporary differences that will result in future tax deductions or future taxable income, as well as the future benefit of tax credit carry forwards. The Company recognizes deferred tax assets to the extent that it believes these assets are more likely than not to be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing temporary differences, projected future taxable income, tax planning strategies, and results of recent operations. On the basis of this evaluation, as of December 31, 2015, no valuation allowances have been recorded in any jurisdiction.

As of December 31, 2015, the Company has an immaterial amount of state net operating loss carryforwards available for income tax purposes. For income tax purposes, the Company has California research tax credits carryforwards of $9.1 million. Federal research tax credit carryforwards from prior years have been utilized or have expired. California credits are available indefinitely to reduce cash taxes otherwise payable. Pursuant to the requirements of ASC 718, the Company does not include unrealized stock option attributes as components of its gross deferred tax assets. The tax-effected amounts of gross unrealized net operating loss and business tax credit carry forwards excluded under ASC 718 for the year ended December 31, 2015 are immaterial.

In general, it is the Company's practice and intention to reinvest the earnings of its non-U.S. subsidiaries in those operations. As of December 31, 2015, the Company has not made a provision for U.S. federal income and state income taxes on accumulated and current earnings of $1.0 million related to certain foreign subsidiaries because these earnings are intended to be indefinitely reinvested in operations outside the U.S. If the Company expects to distribute those earnings in the form of dividends or otherwise, the Company would be subject to U.S. and state income taxes reported as a component of income tax expense, in the amount of $0.4 million. This amount may be reduced by any foreign tax credits available at the time of repatriation.

The Company files income tax returns in the United States and various states and foreign jurisdictions. In the normal course of business, the Company is subject to examination by taxing authorities, including major jurisdictions as the United States, California, the United Kingdom and Germany. In 2012, the Company concluded audits by the IRS and the California Franchise Tax Board for years 2008 and 2009. However, all of the net operating loss and research credit carryforwards that may be used in future years are subject to adjustment, if and when utilized. As such the Company's U.S. federal and California tax years remain open from 1996 and 1992, respectively. In late 2014, the Company was contacted by the IRS for a limited scope audit for tax years 2011 and 2012. In 2015, the audit was expanded to include 2013. At this time, the Company does not believe results of this audit will have a material impact on its financial statements.

The aggregate change in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for the three years ended December 31, 2015 is as follows:



	(In thousands)
Year Ended December 31, 2012	$	6,915
Increases related to tax positions taken during a prior period	406
Decreases related to tax positions taken during the prior period	(79		)
Increases related to tax positions taken during the current period	764
Decreases related to settlements	—
Decreases related to expiration of statute of limitations	(32		)
Year Ended December 31, 2013	7,974
Increases related to tax positions taken during a prior period	63
Decreases related to tax positions taken during the prior period	(89		)
Increases related to tax positions taken during the current period	801
Decreases related to settlements	—
Decreases related to expiration of statute of limitations	(264		)
Year Ended December 31, 2014	8,485
Increases related to tax positions taken during a prior period	37
Decreases related to tax positions taken during the prior period	(895		)
Increases related to tax positions taken during the current period	1,807
Decreases related to settlements	—
Decreases related to expiration of statute of limitations	(284		)
Year Ended December 31, 2015	$	9,150

As of December 31, 2015 the total amount of gross unrecognized tax benefits, if realized, would decrease the Company's tax expense by approximately $6.0 million. The Company recognizes interest and/or penalties related to uncertain tax positions in operating expenses, which for 2015 was immaterial. The Company does not believe there will be any material changes in its unrecognized tax positions over the next twelve months.