Non-controlling Interest - Distributions Paid or Payable (Details) - USD ($)		3 Months Ended
	May 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders	$ 22,610	$ 5,849,000	$ 4,887,000
Tax and other distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders		3,588,000	3,003,000
Dividend distributions
Dividends Payable [Line Items]
Distributions paid or payable to or on behalf of non-controlling unitholders		$ 2,261,000	$ 1,884,000