Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common units outstanding (in shares)	12,245,920	12,232,006
Common units issued (in shares)	12,245,920	12,232,006
Preferred units issued (in shares)	250,000	258,844
Preferred units outstanding (in shares)	250,000	258,844
Preferred unit par value per unit	$ 1,000	$ 1,000
Preferred unit liquidation preference per unit	$ 1,500	$ 1,500