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Income Taxes - Reconciliation of our uncertain tax positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in unrecognized tax benefits |  |  |
Balance as of January 1 | $ 26,704 | $ 25,770 | $ 25,711
Additions for tax positions of prior years | 19,760 | 1,887 | 1,003
Reductions for tax positions of prior years | (476) | (953) | (860)
Settlements |  |  | (84)
Balance as of December 31 | 45,988 | 26,704 | 25,770
Interest and penalties on unrecognized tax benefits | 14,400 | 7,600 | 7,700
Liability related to unrecognized tax benefit for accrued interest and penalties | $ 6,900 | $ (600) | $ 800

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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 decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + 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)(3) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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