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Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Gross Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning balance of unrecognized tax benefits | $ 54,163 | $ 69,784 | $ 68,301
Decrease for prior period tax positions | (695) | (24,154) | (867)
Increase for prior period tax positions | 263 | 7,023 | 736
Increase for current period tax positions | 1,354 | 1,510 | 1,614
Ending balance of unrecognized tax benefits | 55,085 | 54,163 | 69,784
Unrecognized tax benefits that could impact effective tax rate, if recognized | 6,200 | 6,400 | 400
Interest and penalties on gross unrecognized tax benefits | $ 500 | $ 300 | $ 0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=123427490&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=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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