Equity Percentage Allocations of Available Cash from Operating Surplus (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Incentive Distribution Made to Member or Limited Partner [Line Items]
General partner's ownership interest	2.00%	2.00%	2.00%
Minimum quarterly distribution [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.37500
Minimum quarterly distribution [Member] | Limited Partner [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	98.00%
Minimum quarterly distribution [Member] | General Partner
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	2.00%
First target distribution [Member] | Limited Partner [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	98.00%
First target distribution [Member] | General Partner
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	2.00%
First target distribution [Member] | Minimum [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.37500
First target distribution [Member] | Maximum [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.43125
Second target distribution [Member] | Limited Partner [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	85.00%
Second target distribution [Member] | General Partner
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	15.00%
Second target distribution [Member] | Minimum [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.43125
Second target distribution [Member] | Maximum [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.46875
Third target distribution [Member] | Limited Partner [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	75.00%
Third target distribution [Member] | General Partner
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	25.00%
Third target distribution [Member] | Minimum [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.46875
Third target distribution [Member] | Maximum [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	0.56250
Thereafter [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Distribution Payment Targets	$ 0.56250
Thereafter [Member] | Limited Partner [Member]
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	50.00%
Thereafter [Member] | General Partner
Incentive Distribution Made to Member or Limited Partner [Line Items]
Marginal percentage interest in distributions	50.00%