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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.

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