Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014
Revenues:
Total revenues	$ 674,479	$ 915,719		$ 2,016,376	$ 2,750,666
Cost of products sold:
Affiliate	156,388	234,485		449,087	660,763
Third-party	445,169	616,757		1,358,197	1,901,022
Operating and maintenance expenses	39,705	37,112		112,697	107,769
General and administrative expenses	5,563	6,388		17,744	17,276
Gain on disposal of assets, net	(13)	(34)		(257)	(16)
Depreciation and amortization	4,983	4,292		14,458	12,898
Total operating costs and expenses	651,795	899,000		1,951,926	2,699,712
Operating income	22,684	16,719		64,450	50,954
Other income (expense):
Interest income	0	4		0	4
Interest expense and other financing costs	6,204	366		16,416	1,088
Other income, net	16	28		51	103
Net income before income taxes	16,496	16,385		48,085	49,973
Provision for income taxes	(3)	(135)		(354)	(339)
Net income	16,493	16,250		47,731	49,634
Net income attributable to General Partner	0	3,985	[1]	0	15,461	[1]
Net income attributable to limited partners	$ 16,493	$ 12,265		$ 47,731	$ 34,173
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.3650	$ 0.3075		$ 1.0450	$ 0.8457
Common Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic	0.35	0.27		1.01	0.75
Earnings Per Share, Diluted	$ 0.35	$ 0.27		$ 1.01	$ 0.75
Weighted Average Number of Shares Outstanding, Basic	24,017	22,811		24,006	22,811
Weighted Average Number of Shares Outstanding, Diluted	24,024	22,883		24,024	22,853
Subordinated Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted	$ 0.35	$ 0.27		$ 1.01	$ 0.75
Weighted Average Number of Shares Outstanding, Basic and Diluted	22,811	22,811		22,811	22,811
Fee Based Revenues [Member]
Revenues:
Revenues: Affiliate	$ 51,920	$ 45,016		$ 143,460	$ 129,043
Revenues: Third-party	787	686		2,089	2,044
Sales Based Revenues [Member]
Revenues:
Revenues: Affiliate	158,848	234,485		456,195	660,763
Revenues: Third-party	$ 462,924	$ 635,532		$ 1,414,632	$ 1,958,816

[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.