Condensed Consolidated Statement of Partners' Capital and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	Total	Limited Partners' Interest Common Unitholders-Public	Limited Partners' Interest Common Unitholders-Affiliates	Limited Partners' Interest Subordinated Unitholders-Affiliates
Balance at Dec. 31, 2012	$ 14,545	$ 125,093	$ (42,399)	$ (68,149)
Balance (in units) at Dec. 31, 2012		6,900,000	625,000	7,525,000
Partners' capital, Period Increase (Decrease)
Units issued for board of directors compensation	21	21
Units issued for board of directors compensation (in units)		1,044
Net income and comprehensive income	3,757	1,723	156	1,878
Distributions paid	(4,437)	(2,035)	(184)	(2,218)
Balance at Mar. 31, 2013	$ 13,886	$ 124,802	$ (42,427)	$ (68,489)
Balance (in units) at Mar. 31, 2013		6,901,044	625,000	7,525,000