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Capital Stock and Share Based Compensation Plans - Additional restricted stock and restricted stock unit vesting (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of RSUs vested | $ 8,518 | $ 11,618 | $ 10,930
Tax benefits realized on shares and units vested | $ 2,019 | $ 2,969 | $ 1,758

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- Definition Disclosure of the aggregate tax benefit realized from the shares and units vested during the annual period. + References No definition available. + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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