Redeemable Preferred Units - Summary of Issuances of Series A Preferred Units (Details) - USD ($)	1 Months Ended									12 Months Ended
	Oct. 31, 2017	Aug. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	May 31, 2016		Mar. 31, 2016		Dec. 31, 2021	Dec. 31, 2020
Temporary Equity Disclosure [Abstract]
Series A Preferred Units outstanding	1,750,000	2,000,000	1,613,100	700,000	1,000,000	1,386,900		1,000,000		9,450,000	9,450,000
Purchase Price	$ 17,500,000	$ 20,000,000	$ 16,131,000	$ 7,000,000	$ 10,000,000	$ 13,869,000		$ 10,000,000		$ 94,500,000	$ 94,500,000
Distribution Rate	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%		3.00%
Redemption Price per Unit	$ 10.00	$ 10.00	$ 10.00	$ 10.00	$ 10.00	$ 10.00		$ 10.00
Earliest Redemption Date	2023-10	2023-08	2023-03	2022-12	2022-09	2023-05	[1]	2023-03	[1]

[1] The holder did not to provide a notice of its intent to redeem prior to the date 180 days before the first optional redemption date. Accordingly, the holder’s next optional redemption date is on the seventh anniversary of the sale of the Series A Preferred Units.