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Income Taxes - Uncertain tax positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
A reconciliation of the beginning and ending liability for uncertain tax positions |  |  |  |
Balance at beginning of year | $ 1,219 | $ 1,795 | $ 3,531 |
Increase Resulting from Current Period Tax Positions | 238 | 131 | 21 |
Increases for tax position taken in prior years | 846 | 15 | 146 |
Decreases due to settlements with taxing authorities | (83) |  | (693) |
Decreases due to lapses in the statute of limitations | (266) | (722) | (1,210) |
Balance at the end of year | 1,954 | 1,219 | $ 1,795 | $ 3,531
Unrecognized tax benefits that would affect the effective tax rate, if recognized | 1,954 |  |  |
Accrued interest and penalties reported as income tax liability | $ 586 | $ 487 |  |
U.S. corporate income tax rate |  |  | 21.00% | 35.00%
Net deferred tax liability |  |  |  | $ 22,452

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- Definition Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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