Equity and Temporary Equity, Conversion of Stock (Details) $ / shares in Units, $ in Millions	1 Months Ended					3 Months Ended	6 Months Ended
	Sep. 30, 2020 $ / shares	May 31, 2020 shares	Feb. 28, 2020	Jan. 31, 2020 $ / shares	Feb. 28, 2019 $ / shares Rate shares	Jun. 30, 2021 USD ($) $ / shares Rate shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 shares	Dec. 31, 2020 shares	Oct. 31, 2020 USD ($)
Conversion of Stock [Line Items]
Temporary Equity, Dividends For Term Two, Percentage		3.00%
SHM South Fork | Safe Harbor
Conversion of Stock [Line Items]
Real Estate Investments, Joint Ventures | $						$ 4.1	$ 4.1			$ 4.3
Conversion of Common OP Units
Conversion of Stock [Line Items]
Conversion of units							37,862	26,105
Series A-1 Preferred OP Units
Conversion of Stock [Line Items]
Conversion of units							16,119	22,226
Series D Preferred OP Units
Conversion of Stock [Line Items]
Temporary Equity, Dividends For Term Two, Percentage | Rate					4.00%
Temporary Equity, Shares Issued					488,958
Temporary Equity, Issuance Price | $ / shares					$ 100.00
Temporary Equity, Dividends For Term One, Percentage					3.75%
Temporary Equity, Shares Outstanding						488,958	488,958
Series D Preferred OP Units | Minimum [Member]
Conversion of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion					100.00
Series D Preferred OP Units | Maximum [Member]
Conversion of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion			160.00		125.00
Common OP Units | Conversion of Common OP Units
Conversion of Stock [Line Items]
Conversion Rate							1.0000
Conversion of units							37,862	26,105
Common OP Units | Series A-1 Preferred OP Units
Conversion of Stock [Line Items]
Conversion Rate							2.4390
Conversion of units							6,610	9,114
Series I Preferred OP Units
Conversion of Stock [Line Items]
Temporary Equity, Shares Issued									922,000
Temporary Equity, Issuance Price | $ / shares				$ 100.00
Temporary Equity, Dividends For Term One, Percentage				3.00%
Temporary Equity, Shares Outstanding						922,000	922,000
Series I Preferred OP Units | Maximum [Member]
Conversion of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion				164.00
Series E Preferred OP Units
Conversion of Stock [Line Items]
Temporary Equity, Dividends For Term Two, Percentage | Rate						5.50%
Temporary Equity, Shares Issued						90,000	90,000
Temporary Equity, Issuance Price | $ / shares						$ 100.00
Temporary Equity, Dividends For Term One, Percentage						5.25%
Temporary Equity, Shares Outstanding						90,000	90,000		90,000
Series E Preferred OP Units | Minimum [Member]
Conversion of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion				100.00
Series E Preferred OP Units | Maximum [Member]
Conversion of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion				145.00
Series F Preferred OP Units
Conversion of Stock [Line Items]
Temporary Equity, Shares Issued		90,000
Temporary Equity, Issuance Price | $ / shares	$ 100.00
Temporary Equity, Shares Outstanding						90,000	90,000		90,000
Series F Preferred OP Units | Minimum [Member]
Conversion of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion			100.00