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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Jan. 31, 2019
Share-based Payment Arrangement, Expense $ 4,000,000 $ 3,400,000    
Share-based Payment Arrangement, Expense, Tax Benefit $ 1,000,000 $ 700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 0      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 263,574 274,990    
Performance-based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 57,870      
The 2019 Long-term Incentive Compensation Program [Member]        
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance       0.00%
PRSU Awards, Percentage of Target Award, Threshold-level Performance       50.00%
PRSU Awards, Percentage of Target Award, Target-Level Performance       100.00%
PRSU Awards, Percentage of Target Award, Maximum-Level Performance       150.00%
Omnibus Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 11,700,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years 219 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 6,100,000 $ 6,700,000    
Phantom Stock Plan [Member] | Phantom Share Units (PSUs) [Member]        
Share-based Payment Arrangement, Expense 100,000 (37,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 22,000 $ 1,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 1 year