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Income Taxes - Balances of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized tax benefits | $ 33,219 | $ 40,878 | $ 41,110 | $ 36,229
Portion that, if recognized, would reduce tax expense and effective tax rate | 30,868 | 40,695 | 40,977 |
Accrued interest on unrecognized tax benefits | 5,204 | 6,240 | 5,459 |
Accrued penalties on unrecognized tax benefits | 14 | 14 | 631 |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | 11,900 |  |  |
Minimum |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | 0 | 0 | 0 |
Portion that, if recognized, would reduce tax expense and effective tax rate | 0 | 0 | 0 |
Maximum |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | 11,859 | 6,268 | 9,541 |
Portion that, if recognized, would reduce tax expense and effective tax rate | $ 10,217 | $ 5,693 | $ 8,224 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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