Subsequent Events sub events (Details)			3 Months Ended	12 Months Ended
	Feb. 03, 2020 USD ($)	Jan. 31, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) ft² $ / shares shares	Dec. 31, 2018 USD ($) ft² $ / shares	Dec. 31, 2017 USD ($) $ / shares
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares				$ 1.0475	$ 1.02	$ 0.94
Proceeds from Issuance of Preferred Stock and Preference Stock					$ (28,951,000)
mortgage debt refinanced				$ 65,607,000	152,770,000	$ 162,945,000
real estate loans commitment amount				414,299,000
Long-term Debt				$ 2,567,022,000	$ 2,299,625,000
Number of units in real estate property | ft²				477	1,347
$1.5 billion unit [Domain]
Subsequent Event [Line Items]
maximum shares available to be issued | shares				1,500,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
real estate loans repaid	$ 12,900,000
Accrued Interest From Loan Repaid	$ 2,700,000
Subsequent Event [Member] | Unitsissued [Member]
Subsequent Event [Line Items]
Unitsissuedcumulative | shares			65,298
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 58,800,000
solis chestnut farm [Domain]
Subsequent Event [Line Items]
real estate loans commitment amount			$ 13,400,000
Number of units in real estate property			256
Series M Preferred Stock [Member]
Subsequent Event [Line Items]
Proceeds from Issuance of Preferred Stock and Preference Stock				$ (61,758,000)
Series M Preferred Stock [Member] | Subsequent Event [Member] | Unitsissued [Member]
Subsequent Event [Line Items]
Unitsissuedcumulative | shares			8,067
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 7,300,000
series M1 preferred stock [Domain] | Subsequent Event [Member] | Unitsissued [Member]
Subsequent Event [Line Items]
Unitsissuedcumulative | shares			469
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 500,000
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares			$ 0.26
Internalization [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Business Combination, Consideration Transferred		$ 154,000,000
Business Combination, Consideration Transferred, Other		$ 25,000,000
Business Acquisition, Share Price | $ / shares		$ 1.55
Business Combination, Consideration To Be Held Back To Pay Sellers		$ 15,000,000