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	58,778	59,030	(252)	$ 0
Cash distributions to partners	(146,048)	(146,048)	0	$ 0
Partners' capital, ending balance (units) at Jun. 30, 2016				109,979,000
Partners' capital, ending balance at Jun. 30, 2016	$ 1,933,481	1,942,083	(8,602)
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	60,518	60,823	(305)	$ 0
Cash distributions to partners	(171,993)	(171,993)	0	0
Cash contributions from noncontrolling interests	725	0	725	$ 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 Jun. 30, 2017	122,579,218			122,579,000
Partners' capital, ending balance at Jun. 30, 2017	$ 2,149,837	$ 2,159,698	$ (9,861)