Non-controlling Interest - Distributions Paid or Payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	$ 10,566	$ 11,460
Tax and other distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	2,277	3,547
Dividend distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	$ 8,289	$ 7,913