Equity - Private Perpetual Preferred Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Preferred Units [Line Items]
Dividends per share (in USD per share)	$ 0.105	$ 0.21	$ 0.42
Private Perpetual Preferred Units, Series 2019
Preferred Units [Line Items]
Private perpetual preferred units, issued (in shares)	4,664,038	4,664,038
Private perpetual preferred units, liquidation preference per share (in USD per share)	$ 13.52	$ 13.52
Cumulative cash distributions (in USD per share)	$ 0.70
Private Perpetual Preferred Units, Series 2014
Preferred Units [Line Items]
Private perpetual preferred units, issued (in shares)	1,560,360	1,560,360
Private perpetual preferred units (in shares)	1,560,360
Private perpetual preferred units, liquidation preference per share (in USD per share)	$ 16.62	$ 16.62
Dividends per share (in USD per share)	$ 0.60