Partners' Capital of the Operating Partnership - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Mar. 25, 2020	Jul. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020
Class of Stock [Line Items]
Common stock, shares issued (in shares)			116,035,827	106,016,287
Aggregate net proceeds after selling commissions			$ 721,665	$ 353,722	$ 130,693
Forward Equity Sale [Member]
Class of Stock [Line Items]
Aggregate net proceeds after selling commissions		$ 354,300
Forward Equity Sale [Member] | Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued (in shares)	5,750,000	5,000,000				5,750,000
Aggregate net proceeds after selling commissions	$ 474,900	$ 354,300
Common units (in units)		5,000,000				5,750,000