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Note 20 - Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Shares
    
Weighted-Average
Exercise Price
Per Share
    
Aggregate
Intrinsic
V
alue
(in millions)
  
Options outstanding, January 1, 2015
    
11,893,761
     $
30.23
     $
29.8
  
Exercised
    
(1,019,240
 )   $
18.36
     $
7.4
  
Forfeited
    
(1,862,080
 )   $
32.55
      
 
  
Options outstanding, December 31, 2015
    
9,012,441
     $
31.09
     $
27.4
  
Exercised
    
(1,167,819
 )   $
18.03
     $
12.4
  
Forfeited
    
(1,830,893
 )   $
39.69
      
 
  
Options outstanding, December 31, 2016
    
6,013,729
     $
32.09
     $
12.1
  
Exercised
    
(83,863
 )   $
18.20
     $
3.4
  
Forfeited
    
(2,464,920
 )   $
35.91
      
 
  
Options outstanding, December 31, 201
7
    
3,464,946
     $
27.81
     $
-
  
Options exercisable (fully vested)
-
                        
December 31, 2015
    
7,617,882
     $
32.90
     $
20.0
  
December 31, 2016
    
5,144,416
     $
32.56
     $
11.3
  
December 31, 201
7
    
3,464,946
     $
27.81
     $
4.0
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
201
7
    
201
6
    
201
5
  
Restricted
stock outstanding as of January 1,
   
1,930,732
      
1,712,534
      
1,911,145
  
Granted (1)
    
646,142
      
756,530
      
729,160
  
Vested
    
(783,872
 )    
(520,539
 )    
(875,202
 )
Forfeited
    
(15,573
 )    
(17,793
 )    
(52,569
 )
Restricted stock outstanding as of December 31,
    
1,777,429
      
1,930,732
      
1,712,534
  
 
(1)
   The weighted-average grant date fair value for restricted stock issued during the years ended December 31, 2017, 2016 and 2015 were $25.04, $26.15 and $25.98, respectively.
Restricted shares have the same voting rights as the Company
’s common stock and are entitled to a cash dividend per share equal to the Company’s common dividend which is taxable as ordinary income to the holder. For the years ended December 31, 2017, 2016 and 2015, the dividends paid on unvested restricted shares were $2.4 million, $2.2 million, and $1.8 million, respectively.
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
 
2017
  
2016
  
2015
Performance share award outstanding as of January 1,
197,249
  
202,754
  
114,268
Granted (1)
135,780
  
100,170
  
145,620
Vested (2)
(97,079)
  
(105,675)
  
(57,134)
Performance share award outstanding as of December 31,
235,950
  
197,249
  
202,754
Performance Shares [Member]  
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
201
7
    
201
6
    
201
5
  
Stock price
   $
24.91
     $
26.29
     $
26.83
  
Dividend yield
(1)
    
0
 %    
0
 %    
0
 %
Risk-free rate
    
1.45
 %    
0.87
 %    
0.98
 %
Volatility (2)
    
18.93
 %    
18.80
 %    
16.81
 %
Term of the award (years)
    
2.88
      
2.88
      
1.88, 2.88