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Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 06, 2017
shares
Jan. 31, 2018
USD ($)
$ / shares
shares
Feb. 28, 2015
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Feb. 22, 2018
USD ($)
$ / shares
Preferred Stock, Par or Stated Value Per Share       $ 1 $ 1    
Common Stock, Par or Stated Value Per Share       $ 0.01 $ 0.01    
ATM Program, Amount Available | $       $ 211,900      
Stock Repurchased During Period, Shares | shares       232,304 257,477 179,696  
Stockholders' Equity Attributable to Noncontrolling Interest | $       $ 127,903 $ 146,735    
Partners' Capital Account, Units, Converted | shares       1,000,000      
ATM Program [Member]              
Stock Issued During Period, Shares, New Issues | shares       0 9,806,377    
Common Stock, Par or Stated Value Per Share     $ 0.01        
Maximum Aggregate Sales Price | $     $ 500,000        
Proceeds from Issuance of Common Stock | $         $ 285,200    
Payments of Stock Issuance Costs | $         $ 2,900    
Subsequent Event [Member]              
Common Stock, Par or Stated Value Per Share             $ 0.01
Stock Repurchase Program, Authorized Amount | $             $ 300,000
Series M Preferred Stock [Member]              
Stock Issued During Period, Shares, New Issues | shares       9,200,000      
Preferred Stock, Dividend Rate, Percentage       5.25%      
Preferred Stock, Par or Stated Value Per Share       $ 1      
Preferred Stock, Liquidation Preference Per Share       $ 25,000      
Series M Preferred Stock [Member] | Subsequent Event [Member]              
Stock Issued During Period, Shares, New Issues | shares   1,380,000          
Preferred stock, Fractional Interest in Share of Stock   0.001%          
Preferred Stock, Par or Stated Value Per Share   $ 1          
Proceeds from Issuance of Preferred Stock and Preference Stock | $   $ 33,400          
Series M Cumulative Redeemable Preferred Stock [Member] | Subsequent Event [Member]              
Preferred Stock, Dividend Rate, Percentage   5.25%          
Series I Preferred Stock [Member]              
Preferred Stock, Dividend Rate, Percentage       6.00% 6.00%    
Preferred Stock, Par or Stated Value Per Share       $ 1 $ 1    
Stock Redeemed or Called During Period, Shares | shares 9,000,000     9,000,000 [1]      
Percentage of Preferred Stock Redeemed 56.25%            
Preferred Stock, Liquidation Preference Per Share       $ 25,000      
Series I, J, K, L or M Preferred Stock [Member]              
Number of Votes       1,000      
Number of Proxies       1,000      
Number of Votes, Depositary       1      
Series J Preferred Stock [Member]              
Preferred Stock, Dividend Rate, Percentage       5.50% 5.50%    
Preferred Stock, Par or Stated Value Per Share       $ 1 $ 1    
Preferred Stock, Liquidation Preference Per Share       $ 25,000      
Series K Preferred Stock [Member]              
Preferred Stock, Dividend Rate, Percentage       5.625% 5.625%    
Preferred Stock, Par or Stated Value Per Share       $ 1 $ 1    
Preferred Stock, Liquidation Preference Per Share       $ 25,000      
Series L Preferred Stock [Member]              
Stock Issued During Period, Shares, New Issues | shares       9,000,000      
Preferred Stock, Dividend Rate, Percentage       5.125%      
Preferred Stock, Par or Stated Value Per Share       $ 1      
Preferred Stock, Liquidation Preference Per Share       25,000      
Depositary Share [Member]              
Preferred Stock, Liquidation Preference Per Share       $ 25      
Convertible Units [Member]              
Stockholders' Equity Attributable to Noncontrolling Interest | $       $ 18,300      
[1] The Company partially redeemed 9,000,000 depositary shares of its issued and outstanding Class I Preferred Stock, representing 56.25% of the issued and outstanding Class I Preferred Stock.