Common and Preferred Unit Distributions Schedule of Distributions Paid (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended												12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common unitholders and general partner
Class of Stock [Line Items]
Distributions per common unit (in dollars per share)	$ 0	$ 0.45	$ 0.45	$ 0	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45
Total distributions paid														$ 16,890	$ 33,150	$ 22,486
Common unitholders and general partner | Cash Distribution
Class of Stock [Line Items]
Total distributions paid	$ 0	$ 5,630	$ 5,630	$ 0	$ 5,630	$ 5,630	$ 5,630	$ 5,630	$ 5,625	$ 5,623	$ 5,623	$ 5,623	$ 5,617
Common unitholders and general partner | Special Tax Distribution
Class of Stock [Line Items]
Distributions per common unit (in dollars per share)								$ 0.85
Total distributions paid								$ 10,635
Preferred Partner
Class of Stock [Line Items]
Distributions to common unitholders and general partner														26,363	30,000	30,265
Total distributions paid														30,113	30,000	30,265
Preferred Partner | Preferred Stock
Class of Stock [Line Items]
Distributions per common unit (in dollars per share)	$ 15.45	$ 15.00	$ 30.00	$ 15.00	$ 30.00	$ 30.00	$ 30.00	$ 30.00	$ 30.00	$ 30.00	$ 30.00	$ 30.00	$ 30.00
Dividends, Preferred Stock, Cash	$ 3,863	$ 3,750	$ 7,500	$ 3,750	$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 7,500	$ 7,765
General Partner
Class of Stock [Line Items]
Distributions to common unitholders and general partner														16,890	33,150	22,486
General Partner | Preferred Partner
Class of Stock [Line Items]
Total distributions paid														602	600	605
General Partner | General Partner
Class of Stock [Line Items]
Total distributions paid														$ 338	$ 663	$ 450