Partners' Capital, Equity and Incentive Compensation Plans (Equity Issuances) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jun. 30, 2019	Feb. 28, 2019
Partners Capital And Distributions [Line Items]
Shares under underwritten offering	450,133,000		450,133,000
Common stock, par value	$ 0.01		$ 0.01
Common stock issuance proceeds, net of costs	$ 83,260	$ 159,360
Proceeds from Issuance or Sale of Equity	$ 83,331
ATM
Partners Capital And Distributions [Line Items]
Percentage used in calculating initial forward sale price per share	100.00%
Class A Common Stock | Underwritten Offering
Partners Capital And Distributions [Line Items]
Shares under underwritten offering					7,762,500
Common stock, par value					$ 0.01
Shares issued		4,000,000
Shares to be issued on a forward basis (in shares)		3,762,500
Common stock issuance proceeds, net of costs	$ 35,800
Class A Common Stock | ATM
Partners Capital And Distributions [Line Items]
Maximum value of stock which may be issued				$ 400,000