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Income Taxes - Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at federal rate of 21% (35% pre-2018) |  |  |  |  |  |  |  |  | $ 15,164 | $ 19,278 | $ 15,250
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 1,227 | 5,246 | (2,238)
Change in valuation allowance |  |  |  |  |  |  |  |  | (12,760) | 12,657 | (1,884)
Foreign tax rate differential |  |  |  |  |  |  |  |  | (2,535) | (4,796) | (15,622)
Unrecognized tax benefit increase |  |  |  |  |  |  |  |  | 898 | 1,262 | 3,007
Tax effect of foreign operations |  |  |  |  |  |  |  |  | 6,698 | 8,546 | 5,532
Tax benefit of research & development |  |  |  |  |  |  |  |  | (2,506) | (2,557) | (1,904)
Transition tax |  |  |  |  |  |  |  |  | 0 | (8,112) | 20,867
Revaluation of deferred tax balances |  |  |  |  |  |  |  |  | 0 | (4,937) | 14,953
Performance-based compensation |  |  |  |  |  |  |  |  | (560) | (4,541) | 2,081
Domestic production activities |  |  |  |  |  |  |  |  | 0 | 0 | (3,793)
Other |  |  |  |  |  |  |  |  | (478) | 832 | 2,188
Total | $ 35,166 | $ 5,136 | $ (22,531) | $ (12,623) | $ 21,054 | $ 2,012 | $ 3,764 | $ (3,952) | $ 5,148 | $ 22,878 | $ 38,437

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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