Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Condensed Consolidated Balance Sheets
Class A limited partners, units par or assigned value (in dollars per unit)	$ 0	$ 0	$ 0
Class A limited partners, units issued	11,100	7,500	7,500
Class A limited partners, units outstanding	11,100	7,500	7,500
Class A limited partners, units authorized	11,100	7,500	7,500