CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Unitholders [Member]	Preferred Partner [Member]	General Partner Interest [Member]
Balance at Dec. 31, 2014	$ 119,956	$ 525,767	$ 204,599	$ (610,410)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,289	(1,655)	10,782	162
Equity-based incentive compensation	732	719		13
Profits interest contribution	74			74
Distributions	(20,497)	(9,229)	(10,782)	(486)
Balance at Jun. 30, 2015	$ 109,554	$ 515,602	$ 204,599	$ (610,647)