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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits, beginning of period | $ 121,715 | $ 112,558 | $ 56,702
Gross increase to positions in prior years | 633 | 1,067 | 22,943
Gross decrease to positions in prior years | (2,140) | (3,296) | (24,949)
Gross increases to current period tax positions | 14,821 | 13,762 | 63,869
Audit settlements | (795) | 0 | (2,977)
Decrease related to lapsing of statute of limitations | (2,381) | (1,574) | (1,368)
Effect of change in exchange rates | 4,057 | (802) | (1,662)
Unrecognized tax benefits, end of period | 135,910 | 121,715 | 112,558
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate | 134,473 | 120,410 | 111,224
Net interest and penalties expense (benefit) | 400 | 708 | $ (990)
Accrued interest | 3,432 | 2,849 |
Accrued penalties | $ 1,645 | $ 1,681 |

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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 decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -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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