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Note 2 - Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Nov. 13, 2014
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) [1]       911,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 12,900 $ 4,900 $ 15,400 $ 11,800  
Proceeds from Stock Options Exercised       $ 6,680 $ 8,623  
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)   0 0 30,000 43,000  
Proceeds from Stock Plans       $ 1,121 $ 1,053  
Time-Based RSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) [1]       252,000    
PSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) [1]       659,000    
PSUs [Member] | Executive Officer [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 172,000          
PSUs [Member] | Non-Executive Employees [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 58,000          
MSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) [1]            
Time-Based RSUs PSUs MSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested   $ 8,400 $ 8,300 $ 33,900 18,500  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding   $ 207,200   $ 207,200    
Share Price (in Dollars per share)   $ 50.71   $ 50.71    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 89,600   $ 89,600    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       5 years    
2015 Executive PSUs [Member] | Executive Officer [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed 300.00%          
2014 Plan [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)           5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)   5,400,000   5,400,000    
Employee Stock Purchase Plan [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)   4,700,000   4,700,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 100   $ 100    
Stock Issued During Period Shares Employee Stock Purchase Plans Intrinsic Value       400 500  
Proceeds from Stock Plans       $ 1,100 $ 1,100  
Share-based Compensation Award, Tranche One [Member] | 2015 Executive PSUs [Member] | Vesting in February 2017 [Member] | Executive Officer [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%          
Share-based Compensation Award, Tranche One [Member] | 2015 Non-Executive PSUs [Member] | Vesting in The First Quarter of 2017 [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%          
Share-based Compensation Award, Tranche Two [Member] | 2015 Executive PSUs [Member] | Executive Officer [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years          
Share-based Compensation Award, Tranche Two [Member] | 2015 Non-Executive PSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years          
Minimum [Member] | Time-Based RSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year    
Minimum [Member] | 2015 Non-Executive PSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed 200.00%          
Maximum [Member] | Time-Based RSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Maximum [Member] | 2015 Non-Executive PSUs [Member]            
Note 2 - Stock-Based Compensation (Details) [Line Items]            
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed 300.00%          
[1] Amount for PSUs reflects the maximum number of shares that can be earned assuming the achievement of the highest level of performance conditions.