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Note 15 - Share-Based and Other Compensation Programs Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement, Expense | [1] | $ 21,414 | $ 17,649 | $ 13,492
Share-based Compensation Arrangement, Amount Deferred as Policy Acquisition Cost |  | 373 | 324 | 269
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Excluding Amounts Deferred as Policy Acquisition Costs, Prior to Income Taxes |  | 21,041 | 17,325 | 13,223
Equity Compensation Plans |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 24,800 |  |
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 | [1] | $ 444 | 453 | 432
RSUs |  |  |  |
Share-based Payment Arrangement, Expense | [1] | 20,694 | 16,591 | 12,207
Non-Qualified Stock Options |  |  |  |
Share-based Payment Arrangement, Expense | [1] | 274 | 603 | 851
Phantom Stock |  |  |  |
Share-based Payment Arrangement, Expense | [1] | $ 2 | $ 2 | $ 2
[1] | Compensation cost is generally recognized over the periods that an employee provides service in exchange for the award. For purposes of calculating compensation cost recognized, we generally consider awards effectively vested (and we recognize the full compensation costs) when grantees become retirement eligible.

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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 Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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