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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unrecognized tax benefits |  |
Unrecognized tax benefits, beginning of year | $ 1,960 | $ 2,008
Tax positions taken during the current year - Increases | 5,671 |
Tax positions taken during a prior year - Increases | 96 | 75
Decreases for settlements during the period |  | (123)
Reductions for lapses of applicable statute of limitations | (954) |
Unrecognized tax benefits, end of year | 6,773 | 1,960
Amount of unrecognized tax benefit, if recognized, that would affect the effective tax rate | 6,773 | 1,960
Interest accrued on unrecognized tax benefit | 153 | 217
Penalties accrued on unrecognized tax benefit | $ 0 | $ 0

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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=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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