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Note 17 - Share-Based Compensation and Other Benefit Programs - Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
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