Non-controlling Interest - Distributions Paid or Payable (Details) - USD ($)		6 Months Ended
	Aug. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	$ 2,261,000	$ 10,971,000	$ 8,912,000
Tax and other distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders		6,450,000	5,144,000
Dividend distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders		$ 4,521,000	$ 3,768,000