Distributions To Unitholders (Details) - $ / shares			3 Months Ended
	May 31, 2017	Feb. 28, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Common Units
Distribution paid per unit			$ 0.4375	$ 0.4310	$ 0.4246	$ 0.4183	$ 0.4121
Aggregate distribution of units			208,594
Class B Preferred
Distribution paid per unit			$ 0.2258	$ 0.2258	$ 0.4500	$ 0.4500	$ 0.4500
Aggregate distribution of units		208,594
Class B Preferred | Subsequent Event
Aggregate distribution of units	184,697