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Equity-based Compensation - Deferred Stock Units Narrative (Details) - Equity Plan [Member] - Deferred Stock Units [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 0
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,100,000	$ 1,200,000	$ 1,200,000
General Partner [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Right to receive common stock, number of shares (shares)	1