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Consolidated Balance Sheets (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Common stock, par value per share $ 0.01 $ 0.01
Common stock, shares authorized 145,000,000 145,000,000
Common stock, shares issued 114,373,727 114,246,393
Common stock, shares outstanding 114,373,727 114,246,393
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Preferred Stock, Dividend Rate, Percentage 8.50% 8.50%
Preferred Stock, Shares Issued 867,846 867,846
Preferred Stock, Shares Outstanding 867,846 867,846
Preferred Stock, Liquidation Preference Per Share $ 50.00 $ 50.00
Redeemable stock, shares issued and outstanding 121,534 107,162
General Partners' Capital Account, Units Outstanding 114,373,727 114,246,393
Limited Partners' Capital Account, Units Outstanding 4,057,657 4,067,174
Limited Partner [Member]    
Redeemable stock, shares issued and outstanding 121,534 107,162
General Partners' Capital Account, Units Outstanding 114,373,727 114,246,393
Limited Partners' Capital Account, Units Outstanding 4,057,657 4,067,174
Preferred Units, Issued 867,846 867,846
Preferred Units, Outstanding 867,846 867,846