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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
As of
December 31, 2017
Class of
Preferred
Stock
 
Shares
Authorized
   
Shares
I
ssued and Outstanding
   
Liquidation Preference
(in thousands)
   
Dividend Rate
   
Annual
Dividend per
Depositary
Share
   
 
Par
Value
 
Optional
Redemption
Date
Class I
   
18,400
     
7,000
    $
175,000
   
6.000%
    $
1.50000
    $
1.00
 
3/20/2017
Class J
   
9,000
     
9,000
     
225,000
   
5.500%
    $
1.37500
    $
1.00
 
7/25/2017
Class K
   
8,050
     
7,000
     
175,000
   
5.625%
    $
1.40625
    $
1.00
 
12/7/2017
Class L
   
10,350
     
9,000
     
225,000
   
5.125%
    $
1.28125
    $
1.00
 
8/16/2022
Class M
   
10,580
     
9,200
     
230,000
   
5.250%
    $
1.31250
    $
1.00
 
12/20/2022
     
 
     
41,200
    $
1,030,000
   
 
     
 
     
 
 
 
As of
December 31, 201
6
Class of
Preferred
Stock
 
Shares
Authorized
   
Shares
Issued and Outstanding
   
Liquidation Preference
(in thousands)
   
Dividend Rate
   
Annual
Dividend per
Depositary
Share
   
 
Par
Value
 
Optional
Redemption
Date
Class I
   
18,400
     
16,000
    $
400,000
   
6.000%
    $
1.50000
    $
1.00
 
3/20/2017
Class J
   
9,000
     
9,000
     
225,000
   
5.500%
    $
1.37500
    $
1.00
 
7/25/2017
Class K
   
8,050
     
7,000
     
175,000
   
5.625%
    $
1.40625
    $
1.00
 
12/7/2017
     
 
     
32,000
    $
800,000
   
 
     
 
     
 
 
 
Preferred Stock Redeemed [Member]  
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
Classes of
Preferred Stock
   
Redemption
Date
   
Depositary
Shares
Redeemed
   
Redemption
Price
   
Redemption
Amount
(in millions)
   
Redemption
Charges
(in
millions)
(1)
 
Class I (
2)
   
9/6/2017
   
9,000,000
    $
25.00
    $
225.0
    $
7.0
 
Class H
   
11/25/2015
   
7,000,000
    $
25.00
    $
175.0
    $
5.8
 
Preferred Stock Issued [Member]  
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
Class of
Preferred Stock
   
Date
Issued
   
Depositary
Shares
Issued
   
Fractional
Interest per
Share
   
Net Proceeds,
Before
Expenses
(in millions)
   
Offering
Price
 
Class L
   
8/16/2017
   
9,000,000
   
1/1000
    $
218.1
     
25.00
 
Class M
   
12/20/2017
   
9,200,000
   
1/1000
    $
222.8
     
25.00