Partners' Capital, Equity and Incentive Compensation Plans (Equity Issuances) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	May 31, 2020	Dec. 31, 2019
Partners Capital And Distributions [Line Items]
Shares under underwritten offering	450,133,000		450,133,000			450,133,000
Common stock, par value	$ 0.01		$ 0.01			$ 0.01
Common stock issuance proceeds, net of costs			$ 134,077	$ 159,026
ATM
Partners Capital And Distributions [Line Items]
Percentage used in calculating initial forward sale price per share	100.00%		100.00%
Prior ATM Program
Partners Capital And Distributions [Line Items]
Proceeds from Issuance or Sale of Equity			$ 134,500
Common stock
Partners Capital And Distributions [Line Items]
Shares issued		4,000,000
Common stock | Underwritten Offering
Partners Capital And Distributions [Line Items]
Share Price	$ 64.90		$ 64.90
Common stock issuance proceeds, net of costs	$ 271,900
Common stock | Maximum | Underwritten Offering
Partners Capital And Distributions [Line Items]
Shares under underwritten offering	4,400,000		4,400,000
Class A Common Stock | ATM
Partners Capital And Distributions [Line Items]
Maximum value of stock which may be issued					$ 500,000
Common stock, par value				$ 0.01
Class A Common Stock | Prior ATM Program
Partners Capital And Distributions [Line Items]
Maximum value of stock which may be issued				$ 400,000