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, 2014				95,029,000
Partners' capital, beginning balance at Dec. 31, 2014	$ 1,229,203	$ 1,229,203	$ 0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	395,289	395,094	195
Noncontrolling Interest, Increase from Business Combination	(6,471)	0	(6,471)
Cash distributions to partners	(186,026)	(186,026)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(560)	0	(560)
Issuance of common units for cash, net (units)				14,950,000
Issuance of common units for cash, net	633,759	633,759	0
Partners' capital, ending balance (units) at Sep. 30, 2015				109,979,000
Partners' capital, ending balance at Sep. 30, 2015	$ 2,065,194	2,072,030	(6,836)
Partners' capital, beginning balance (units) at Dec. 31, 2015	109,979,218			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	90,761	91,131	(370)
Cash distributions to partners	(227,454)	(227,454)	0
Issuance of common units for cash, net (units)				8,000,000
Issuance of common units for cash, net	$ 298,051	298,051	0
Partners' capital, ending balance (units) at Sep. 30, 2016	117,979,218			117,979,000
Partners' capital, ending balance at Sep. 30, 2016	$ 2,182,109	$ 2,190,829	$ (8,720)