Distributions and Net Income Per Limited Partner Unit (Incentive Distribution Rights) (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares
Above $0.3163 up to $0.3438 | Unit Holders [Member]
Distribution Made to Limited Partner [Line Items]
Marginal Percentage Interest in Distributions	85.00%
Above $0.3163 up to $0.3438 | IDR Holders [Member]
Distribution Made to Limited Partner [Line Items]
Marginal Percentage Interest in Distributions	15.00%
Above $0.3438 up to $0.4125 | Unit Holders [Member]
Distribution Made to Limited Partner [Line Items]
Marginal Percentage Interest in Distributions	75.00%
Above $0.3438 up to $0.4125 | IDR Holders [Member]
Distribution Made to Limited Partner [Line Items]
Marginal Percentage Interest in Distributions	25.00%
Above $0.4125 | Unit Holders [Member]
Distribution Made to Limited Partner [Line Items]
Marginal Percentage Interest in Distributions	50.00%
Above $0.4125 | IDR Holders [Member]
Distribution Made to Limited Partner [Line Items]
Marginal Percentage Interest in Distributions	50.00%
Minimum [Member] | Above $1.2938 up to $1.4063
Distribution Made to Limited Partner [Line Items]
Quarterly distribution per unit threshold (usd per share)	$ 1.2938
Minimum [Member] | Above $1.4063 up to $1.6875
Distribution Made to Limited Partner [Line Items]
Quarterly distribution per unit threshold (usd per share)	1.4063
Minimum [Member] | Above $1.6875
Distribution Made to Limited Partner [Line Items]
Quarterly distribution per unit threshold (usd per share)	1.6875
Maximum [Member] | Above $1.2938 up to $1.4063
Distribution Made to Limited Partner [Line Items]
Quarterly distribution per unit threshold (usd per share)	1.4063
Maximum [Member] | Above $1.4063 up to $1.6875
Distribution Made to Limited Partner [Line Items]
Quarterly distribution per unit threshold (usd per share)	$ 1.6875