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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |  |  |  |
Increase (decrease) in deferred tax asset valuation allowance |  | $ 3,300 |  |  |
Operating loss carryforwards | $ 2,800,000 | 2,800,000 |  |  |
Deferred tax asset. operating loss carryforward | 589,067 | 589,067 |  |  | $ 495,252
Earnings expected to be repatriated in next fiscal year | 100,000 | 100,000 |  |  |
Deferred tax liability, undistributed foreign earnings | 5,000 | 5,000 |  |  | 5,000
Undistributed foreign earnings | 1,400,000 | 1,400,000 |  |  |
Other recorded liabilities for interest and penalties | 300 | 300 | $ 200 |  | 100
Income tax expense (benefit) related to interest and penalties | (100) | (100) | (100) |  | $ (100)
Provisional tax expense |  |  |  | $ 274,000 |
2017 Tax Act measurement adjustment |  |  | $ 135,700 |  |
Alternative minimum tax refund, CARES Act | 18,500 |  |  |  |
Minimum |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Expected liability to be added for uncertain taxes during next twelve months | 200 | 200 |  |  |
Maximum |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Expected liability to be added for uncertain taxes during next twelve months | $ 1,000 | $ 1,000 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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