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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components of Income Before Income Taxes

For financial reporting purposes, income before income taxes includes the following components (in thousands):

			Years Ended December 31,
			2020						2019						2018
United States			$	19,405					$	(16,317)					$	16,312
Foreign			79,221						88,527						75,487
Total			$	98,626					$	72,210					$	91,799

Summary of Income Tax Expense (Benefit)

The expense (benefit) for income taxes consists of the following (in thousands):

			Years Ended December 31,
			2020						2019						2018
Federal
Current			$	(2,683)					$	3,738					$	6,545
Deferred			(3,477)						(25,150)						(6,587)
Total			(6,160)						(21,412)						(42)
State
Current			2,514						590						4,441
Deferred			(1,758)						342						(2,649)
Total			756						932						1,792
Foreign
Current			22,786						22,960						17,626
Deferred			8,584						2,668						3,502
Total			31,370						25,628						21,128
Total			$	25,966					$	5,148					$	22,878

Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Operations

Differences between the income tax expense computed at the statutory federal income tax rate and per the consolidated statements of operations are summarized as follows (in thousands):

			Years Ended December 31,
			2020						2019						2018
Tax expense at federal rate of 21%			$	20,711					$	15,164					$	19,278
State income taxes, net of federal benefit			321						1,227						5,246
Change in valuation allowance			2,459						(12,760)						12,657
Foreign tax rate differential			(1,809)						(2,535)						(4,796)
Unrecognized tax benefit increase (decrease)			(4,405)						898						1,262
Tax effect of foreign operations			11,373						6,698						8,546
Tax benefit of research & development			(2,173)						(2,506)						(2,557)
Transition tax			—						—						(8,112)
Revaluation of deferred tax balances			—						—						(4,937)
Performance-based compensation			(2,624)						(560)						(4,541)
Other			2,113						(478)						832
Income tax provision			$	25,966					$	5,148					$	22,878

Summary of Deferred Tax Assets and Liabilities

The deferred tax assets and liabilities result from differences in the timing of the recognition of certain income and expense items for tax and financial accounting purposes. The sources of these differences at each balance sheet date are as follows (in thousands):

			December 31,
			2020						2019
Deferred income tax assets:
Net operating loss carryforwards			$	20,347					$	23,030
Tax credits			40,188						47,411
Compensation			18,731						18,791
Deferred revenue			19,169						25,599
Operating lease			10,162						12,956
Other			9,051						8,517
Gross deferred income tax assets			117,648						136,304
Less: valuation allowance			(10,112)						(7,653)
Net deferred income tax assets			$	107,536					$	128,651
Deferred income tax liabilities:
Depreciation and amortization			$	(48,967)					$	(52,978)
Operating lease right-of-use asset			(7,650)						(11,917)
Deferred revenue			(33,947)						(44,198)
Total deferred income tax liabilities			(90,564)						(109,093)
Net deferred income taxes			$	16,972					$	19,558
Deferred income taxes / liabilities included in the balance sheet are:
Deferred income tax asset – noncurrent			$	57,476					$	51,611
Deferred income tax liability – noncurrent			(40,504)						(32,053)
Net deferred income taxes			$	16,972					$	19,558

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31 is as follows (in thousands):

			2020						2019						2018
Balance of unrecognized tax benefits at beginning of year			$	29,000					$	28,406					$	27,237
Increases for tax positions of prior years			4,219						2,784						315
Decreases for tax positions of prior years			—						(96)						(61)
Increases for tax positions established for the current period			3,912						2,542						1,185
Decreases for settlements with taxing authorities			(285)						(220)						—
Reductions resulting from lapse of applicable statute of limitation			(12,630)						(4,462)						(115)
Adjustment resulting from foreign currency translation			94						46						(155)
Balance of unrecognized tax benefits at end of year			$	24,310					$	29,000					$	28,406

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