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Note 21 - Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Shares

  

Weighted-Average

Exercise Price

Per Share

  

Aggregate Intrinsic Value

(in millions)

 

Options outstanding, January 1, 2018

  3,464,946  $27.81  $- 

Exercised

  (42,259) $14.00  $0.1 

Forfeited

  (1,781,321) $36.53     

Options outstanding, December 31, 2018

  1,641,366  $18.78  $0.4 

Exercised

  (268,856) $14.43  $1.1 

Forfeited

  (74,574) $20.24     

Options outstanding, December 31, 2019

  1,297,936  $19.60  $2.0 

Exercised

  (63,365) $15.48  $0.2 

Forfeited

  (72,250) $16.20     

Options outstanding, December 31, 2020

  1,162,321  $20.03  $- 

Options exercisable (fully vested) -

            

December 31, 2018

  1,641,366  $18.78  $0.4 

December 31, 2019

  1,297,936  $19.60  $2.0 

December 31, 2020

  1,162,321  $20.03  $- 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
  

2020

  

2019

  

2018

 

Restricted stock outstanding as of January 1,

  2,367,843   2,104,914   1,777,429 

Granted (1)

  820,150   884,170   1,100,590 

Vested

  (784,120)  (603,148)  (751,201)

Forfeited

  (9,048)  (18,093)  (21,904)

Restricted stock outstanding as of December 31,

  2,394,825   2,367,843   2,104,914 
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]
  

2020

  

2019

  

2018

 

Performance share awards outstanding as of January 1,

  704,530   433,230   235,950 

Granted (1)

  506,720   407,080   297,450 

Vested (2)

  (297,450)  (135,780)  (100,170)

Performance share awards outstanding as of December 31,

  913,800   704,530   433,230 
Performance Shares [Member]  
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

2020

  

2019

  

2018

 

Stock price

 $18.93  $17.81  $14.99 

Dividend yield (1)

  0%  0%  0%

Risk-free rate

  1.42%  2.52%  2.39%

Volatility (2)

  24.67%  24.55%  22.90%

Term of the award (years)

  2.88   2.88   2.85