Consolidated Statements of Partners' Capital - USD ($) $ in Thousands	Total	Partners' Capital	Partners' Capital Number of Common Units	Noncontrolling Interest
Partners' capital, units (in shares) at Dec. 31, 2013			88,691,000
Partners' capital, value at Dec. 31, 2013	$ 1,097,737	$ 1,097,737		$ 0
Net income (loss)	106,202	106,202	$ 0	0
Cash distributions to partners, net	(200,461)	(200,461)	$ 0	0
Issuance of units for cash, net, units			4,600,000
Issuance of units for cash, net	225,725	225,725		0
Conversion of waiver units (in units)			1,738,000
Conversion of waiver units	0	0		0
Partners' capital, units (in shares) at Dec. 31, 2014			95,029,000
Partners' capital, value at Dec. 31, 2014	1,229,203	1,229,203		0
Net income (loss)	421,585	422,528	$ 0	(943)
Noncontrolling interest from acquisition	(6,447)	0	0	(6,447)
Cash distributions to partners, net	(256,389)	(256,389)	0	0
Cash distributions to noncontrolling interests	(960)	0	$ 0	(960)
Issuance of units for cash, net, units			14,950,000
Issuance of units for cash, net	$ 633,759	633,759		0
Partners' capital, units (in shares) at Dec. 31, 2015	109,979,218		109,979,000
Partners' capital, value at Dec. 31, 2015	$ 2,020,751	2,029,101		(8,350)
Net income (loss)	111,082	113,249	$ 0	(2,167)
Cash distributions to partners, net	(310,039)	(310,039)	0	0
Cash contributions from noncontrolling interests	236	0	$ 0	236
Issuance of units for cash, net, units			8,000,000
Issuance of units for cash, net	$ 298,020	298,020		0
Partners' capital, units (in shares) at Dec. 31, 2016	117,979,218		117,979,000
Partners' capital, value at Dec. 31, 2016	$ 2,120,050	$ 2,130,331		$ (10,281)