Partners' Capital, Equity and Incentive Compensation Plans - Summary of Equity Issued (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Forward Shares Sold/(Settled)
Shares and net proceeds available, beginning balance (in shares)	9,961
Forward Equity - Sales (in shares)	1,504
Forward Equity - Settlement (in shares)	(3,865)
Shares and net proceeds available, ending balance (in shares)	7,600
Net Proceeds Available/(Received)
Shares and net proceeds available, beginning balance	$ 581,598
Forward Equity - Sales	91,620
Forward Equity - Settlements	(215,964)
Shares and net proceeds available, ending balance	457,254
Proceeds from issuance or sale of equity, excluding dividends		$ 587,600
Dividends declared	$ 6,000