Non-controlling Interest - Distributions Paid or Payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	$ 10,780	$ 10,566
Tax and other distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	2,113	2,277
Dividend distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	$ 8,667	$ 8,289