Consolidated Statements of Changes in Partners' Capital (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Partnership units distributions per unit	$ 0.13	$ 0.13	$ 0.13	$ 0.125
Series B Preferred Units [Member]
Preferred units distributions per unit	0.50	0.50	0.50	0.50
Series C Preferred Units [Member]
Preferred units distributions per unit	0.492188	0.492188	0.492188	$ 0.492188
Series D Preferred Units [Member]
Preferred units distributions per unit	$ 0.515625	$ 0.515625	$ 0.41823