Consolidated Statements of Operations Statement (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues [Abstract]
Revenues, affiliate	$ 1,011,575	$ 882,533	$ 852,310
Revenues, third-party	2,490,313	2,524,595	2,622,610
Total revenues	3,501,888	3,407,128	3,474,920
Cost of Goods Sold [Abstract]
Cost of products sold, affiliate	871,751	853,447	849,143
Cost of products sold, third-party	2,373,168	2,426,270	2,529,944
Operating Costs and Expenses [Abstract]
Operating and maintenance expenses	142,398	135,307	115,374
General and administrative expenses	22,540	17,661	16,806
Loss (gain) and impairments on disposal of assets, net	157	0	(174)
Depreciation and amortization	17,372	15,970	14,315
Total operating costs and expenses	3,427,386	3,448,655	3,525,408
Operating income (loss)	74,502	(41,527)	(50,488)
Other income (expense):
Interest income	4	7	22
Interest expense and other financing costs	(1,851)	(213)	(40)
Amortization of loan fees	(523)	(109)	0
Other income, net	120	143	292
Net income (loss) before income taxes	72,252	(41,699)	(50,214)
Provision for income taxes	(459)	(95)	0
Net income (loss)	(71,793)	41,794	50,214
Less net income (loss) attributable to Predecessor	18,801	(50,322)	(50,214)
Net income attributable to partners	$ 52,992	$ 8,528
Earnings Per Share [Abstract]
Cash distributions declared per common unit	$ 1.1632	$ 0
Common Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 1.16	$ 0.19
Earnings Per Share, Diluted	$ 1.15	$ 0.19
Weighted Average Number of Shares Outstanding, Basic	23,059	22,811
Weighted Average Number of Shares Outstanding, Diluted	23,107	22,813
Subordinated Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted	$ 1.15	$ 0.19
Weighted Average Number of Shares Outstanding, Basic and Diluted	22,811	22,811