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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Summary of Components of Income Before Provision for Income Taxes

The components of income before income tax expense are as follows:

	Year ended
	December 31, 2018			December 31, 2017			December 31, 2016
	(in thousands)
Ireland	$	243,988		$	218,306		$	201,221
United States	27,499			28,426			11,466
Other	93,127			81,325			87,485
Income before provision for income taxes	$	364,614		$	328,057		$	300,172

Summary of Components of Provision for Income Taxes

The components of provision for income taxes are as follows:

	Year ended
	December 31, 2018			December 31, 2017			December 31, 2016
	(in thousands)
Provision for income taxes:
Current tax expense:
Ireland	$	28,042		$	20,084		$	22,931
United States	2,885			5,792			7,768
Other	9,379			9,964			5,749
Total current tax expense	40,306			35,840			36,448
Deferred tax expense/(benefit):
Ireland	1,054			261			1,284
United States	875			8,980			613
Other	(277		)	1,488			(352		)
Total deferred tax expense	1,652			10,729			1,545
Provision for income taxes	41,958			46,569			37,993
Impact on shareholders equity and other comprehensive income of the tax consequence of :
Excess tax benefit on stock compensation	—			—			(4,332		)
Currency impact on long term funding	119			973			(396		)
Fair value of cash flow hedge	(148		)	148			—
Total	$	41,929		$	47,690		$	33,265

Schedule of Reconciliation of Consolidated Reported Provision for Income Taxes and Statutory Rate

The Company's consolidated reported provision for income taxes differed from the amount that would result from applying the Irish statutory rate as set forth below:

	Year ended
	December 31, 2018			December 31, 2017			December 31, 2016
	(in thousands)
Taxes at Irish statutory rate of 12.5% (2017:12.5%; 2016:12.5%)	$	45,577		$	41,007		$	37,522
Foreign and other income taxed at higher rates	7,649			6,324			4,642
Research & development tax incentives	(1,243		)	(830		)	(907		)
Movement in valuation allowance	5,667			1,329			1,208
Effects of change in tax rates	(147		)	925			576
Increase/(decrease) in unrecognized tax benefits	(5,423		)	933			(1,521		)
Impact of stock compensation	(8,301		)	(9,917		)	(4,121		)
Impact of deemed repatriation under US Tax Reform	—			7,694			—
Other	(1,821		)	(896		)	594
Provision for income taxes	$	41,958		$	46,569		$	37,993

Schedule of Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities

The tax effects of temporary differences that give rise to significant portions of deferred tax assets and deferred tax liabilities are presented below:

	December 31, 2018			December 31, 2017
	(in thousands)
Deferred tax liabilities:
Property, plant and equipment	$	981		$	1,139
Goodwill	25,149			22,655
Other intangible assets	9,397			11,801
Other	5,703			4,139
Total deferred tax liabilities recognized	41,230			39,734
Deferred tax assets:
Operating loss and tax credits carry-forwards	29,995			24,962
Property, plant and equipment	4,893			4,062
Accrued expenses and payments on account	24,599			24,433
Stock compensation	6,490			5,786
Deferred compensation	2,197			2,548
Deferred revenue	5,681			—
Other	2			740
Total deferred tax assets	73,857			62,531
Valuation allowance for deferred tax assets	(27,263		)	(22,439		)
Deferred tax assets recognized	46,594			40,092
Overall net deferred tax asset	$	5,364		$	358

Schedule of Expected Expiry Dates of NOL's

The expected expiry dates of these losses are as follows:

	Federal NOL's			State NOL's
	(in thousands)
2021-2034	14,323			12,158
2035-2037	766			20,464
	$	15,089		$	32,622

Schedule of Reconciliation of Beginning and Ending Amount of Total Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of total unrecognized tax benefits is as follows:

	December 31, 2018			December 31, 2017			December 31, 2016
	(in thousands)
Unrecognized tax benefits at start of year	$	23,720		$	26,620		$	28,166
Increase related to prior year tax positions	2,084			—			1,151
Decrease related to prior year tax positions	(2,915		)	(3,050		)	(2,483		)
Increase related to current year tax positions	3,065			4,765			1,104
Settlements	(182		)	(2,523		)	(837		)
Lapse of statute of limitations	(4,339		)	(2,092		)	(481		)
Unrecognized tax benefits at end of year	$	21,433		$	23,720		$	26,620

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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