Statement of Changes in Partners' Deficit (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	General Partner [Member]	Limited Partner [Member]
Partners' deficit at December 31, 2014 at Dec. 31, 2014	$ (25,916)	$ (806)	$ (25,110)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income for the three months ended March 31, 2015	28,743	287	28,456
Partners' (deficit) capital at March 31, 2015 at Mar. 31, 2015	$ 2,827	$ (519)	$ 3,346