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Note 17 - Share-Based Compensation and Other Benefit Programs - Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expense | $ 19,193 | $ 21,414 | $ 17,649
Share-based Compensation Arrangement, Amount Deferred as Policy Acquisition Cost | 0 | 373 | 324
Share-based Payment Arrangement, Expense, Federal Income Tax Expense (Benefit) | 4,264 | 6,343 | 2,863
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Excluding Amounts Deferred as Policy Acquisition Costs, Prior to Income Taxes | 14,929 | 14,698 | 14,462
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Excluding Amounts Deferred as Policy Acquisition Costs, Prior to Income Taxes | 19,193 | 21,041 | 17,325
Equity Compensation Plans |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 22,700 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 10 months 24 days |  |
Employee Stock Purchase Plan |  |  |
Share-based Payment Arrangement, Expense | $ 671 | 444 | 453
RSUs |  |  |
Share-based Payment Arrangement, Expense | 18,403 | 20,694 | 16,591
Non-Qualified Stock Options |  |  |
Share-based Payment Arrangement, Expense | $ 119 | $ 276 | $ 605

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- Definition Amount included in total compensation cost recognized of share-based plans related to the amounts deferred as policy acquisition related expenses. + References No definition available. + Details
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- Definition Pretax compensation expense related to share-based compensation plans excluding reduction for amounts deferred as policy acquisition costs. + References No definition available. + Details
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- Definition Share-based Payment Arrangement, Compensation Cost, Excluding Amounts Deferred as Policy Acquisition Costs, Net of Income Taxes + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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