Consolidated Statements of Partners' Capital - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	General Partner [Member]	Common Unitholders [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance at Dec. 31, 2014	$ 550,281	$ 11,341	$ 542,276	$ (3,336)
Partners' capital rollforward
Net income	4,590	1,133	3,457	0
Distributions	(50,956)	(1,881)	(49,075)	0
Equity compensation	1,659	0	1,659	0
Other comprehensive income (loss)	(2,001)	0	0	(2,001)
Ending balance at Sep. 30, 2015	$ 503,573	$ 10,593	$ 498,317	$ (5,337)