Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2021		Dec. 31, 2020
Common stock, par value per share	$ 0.01		$ 0.01
Common stock, shares authorized	145,000,000		145,000,000
Common stock, shares issued	114,408,949		114,373,727
Common stock, shares outstanding	114,408,949		114,373,727
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	[1]	$ 50.00
Redeemable stock, shares issued and outstanding	123,496		121,534
General Partners' Capital Account, Units Outstanding	114,408,949
Limited Partners' Capital Account, Units Outstanding	4,053,106
Limited Partner [Member]
Redeemable stock, shares issued and outstanding	123,496		121,534
General Partners' Capital Account, Units Outstanding	114,408,949		114,373,727
Limited Partners' Capital Account, Units Outstanding	4,053,106		4,057,657
Preferred Units, Issued	867,846		867,846
Preferred Units, Outstanding	867,846		867,846

[1] The total liquidation preference for the outstanding preferred stock is $43.4 million.