Unaudited Condensed Consolidated Statements Of Partners' Capital - USD ($) $ in Thousands	Total	Partners’ Capital	Noncontrolling Interest	Common Units Partners’ Capital
Partners' capital, beginning balance (units) at Dec. 31, 2015				109,979,000
Partners' capital, beginning balance at Dec. 31, 2015	$ 2,020,751	$ 2,029,101	$ (8,350)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	35,177	35,303	(126)
Cash distributions to partners	(72,087)	(72,087)	0
Partners' capital, ending balance (units) at Mar. 31, 2016				109,979,000
Partners' capital, ending balance at Mar. 31, 2016	$ 1,983,841	1,992,317	(8,476)
Partners' capital, beginning balance (units) at Dec. 31, 2016	117,979,218			117,979,000
Partners' capital, beginning balance at Dec. 31, 2016	$ 2,120,050	2,130,331	(10,281)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	26,938	27,090	(152)
Cash distributions to partners	(83,765)	(83,765)	0
Issuance of common units for cash, net (units)				4,600,000
Issuance of common units for cash, net	$ 140,537	140,537	0
Partners' capital, ending balance (units) at Mar. 31, 2017	122,579,218			122,579,000
Partners' capital, ending balance at Mar. 31, 2017	$ 2,203,760	$ 2,214,193	$ (10,433)