Partners' Capital, Equity and Incentive Compensation Plans - Summary of Equity Issued (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020
Forward Shares Sold/(Settled)
Beginning Balance, Forward Shares Sold/(Settled) (in shares)	10,299
Sales (in shares)	114
Settlement (in shares)	(2,948)
Ending Balance, Forward Shares Sold/(Settled) (in shares)	7,465	10,299
Net Proceeds Available/(Received)
Beginning Balance, Net Proceeds Available/(Received)	$ 584,924
Sales	7,348
Settlements	(151,844)
Ending Balance, Net Proceeds Available/(Received)	$ 440,428	$ 584,924
Proceeds from issuance or sale of equity, excluding dividends		591,000
Dividends declared		$ 6,000