Equity - Issuance of OP Units and Series 2 CPOP Units in Connection with the Acquisition of the Properties (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended
	Mar. 05, 2020 USD ($) building $ / shares shares	Sep. 20, 2019	Sep. 30, 2020 USD ($) building	Sep. 30, 2020 USD ($) building	Sep. 30, 2019 USD ($)	Jun. 19, 2020 building
Business Acquisition [Line Items]
Number of Buildings | building			40	40
Acquisition Purchase Price			$ 352,558	$ 352,558
Issuance of 4.00% cumulative redeemable convertible preferred units			0	67,482
Issuance of cumulative redeemable convertible preferred units				40,787	$ 27,359
Preferred Stock, Liquidation Preference, Value	$ 40,800
Partners' Capital Account, Units | shares	0.7722
Noncontrolling Interests
Business Acquisition [Line Items]
Issuance of 4.00% cumulative redeemable convertible preferred units			0	67,482
Issuance of cumulative redeemable convertible preferred units				40,787	$ 27,359
Operating Partnership | Noncontrolling Interests
Business Acquisition [Line Items]
Limited Partners' Capital Account, Units Issued | shares	1,406,170
Properties Acquired on March 5, 2020 and June 19, 2020
Business Acquisition [Line Items]
Number of Buildings | building	10					1
Acquisition Purchase Price			$ 214,200	$ 214,200
Properties Acquired on March 5, 2020 and June 19, 2020 | Noncontrolling Interests
Business Acquisition [Line Items]
Issuance of 4.00% cumulative redeemable convertible preferred units	$ 67,500
Series 2 CPOP Units | Properties Acquired on March 5, 2020 and June 19, 2020
Business Acquisition [Line Items]
Acquisition, preferred units issued (in units) | shares	906,374
Preferred Stock, Dividend Rate, Percentage	4.00%
Issuance of cumulative redeemable convertible preferred units	$ 40,800
Preferred Stock, Liquidation Preference Premium | $ / shares	$ 45.00
Series A Preferred Units
Business Acquisition [Line Items]
Preferred Stock, Dividend Rate, Percentage				5.875%
Series B Preferred Units
Business Acquisition [Line Items]
Preferred Stock, Dividend Rate, Percentage			5.875%
Series C Preferred Units
Business Acquisition [Line Items]
Preferred Stock, Dividend Rate, Percentage		5.625%