Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014
Revenues:
Fee based revenue, affiliate	$ 46,062	$ 44,456		$ 91,540	$ 84,027
Fee based revenue, third-party	679	657		1,302	1,358
Sales based revenue, affiliate	164,576	229,265		297,347	426,278
Sales based revenue, third-party	523,184	695,959		951,708	1,323,284
Total revenues	734,501	970,337		1,341,897	1,834,947
Cost of products sold:
Affiliate	162,191	229,265		292,699	426,278
Third-party	501,835	676,461		913,028	1,284,265
Operating and maintenance expenses	37,355	36,974		72,992	70,657
General and administrative expenses	6,250	5,691		12,181	10,888
Loss (gain) on disposal of assets, net	(160)	18		(244)	18
Depreciation and amortization	4,737	4,454		9,475	8,606
Total operating costs and expenses	712,208	952,863		1,300,131	1,800,712
Operating income	22,293	17,474		41,766	34,235
Other income (expense):
Interest expense and other financing costs	(6,248)	(361)		(10,212)	(722)
Other income, net	18	32		35	75
Net income before income taxes	16,063	17,145		31,589	33,588
Provision for income taxes	(148)	(85)		(351)	(204)
Net income	15,915	17,060		31,238	33,384
Net income attributable to General Partner	0	6,085	[1]	0	11,476	[1]
Net income attributable to limited partners	$ 15,915	$ 10,975		$ 31,238	$ 21,908
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.3475	$ 0.2975		$ 0.6800	$ 0.5382
Common Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic	0.34	0.24		0.66	0.48
Earnings Per Share, Diluted	$ 0.34	$ 0.24		$ 0.66	$ 0.48
Weighted Average Number of Shares Outstanding, Basic	24,017	22,811		24,001	22,811
Weighted Average Number of Shares Outstanding, Diluted	24,051	22,861		24,023	22,838
Subordinated Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted	$ 0.34	$ 0.24		$ 0.66	$ 0.48
Weighted Average Number of Shares Outstanding, Basic and Diluted	22,811	22,811		22,811	22,811

[1] For historical periods prior to the Wholesale Acquisition, we have applied the two-class method to calculate earnings per unit. The net income of WRW prior to the Wholesale Acquisition was allocated entirely to the general partner.