Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Total revenues		$ 569,261	$ 680,670	$ 1,615,902	$ 2,023,970
Cost of products sold:
Affiliate		128,792	156,388	347,811	449,087
Third-party		366,744	445,169	1,047,571	1,358,197
Operating and maintenance expenses		43,454	45,927	131,103	131,156
Selling, general and administrative expenses		6,483	5,812	17,854	18,517
Gain on disposal of assets, net		(62)	(13)	(963)	(257)
Depreciation and amortization		10,579	8,963	29,470	25,816
Total operating costs and expenses		555,990	662,246	1,572,846	1,982,516
Operating income		13,271	18,424	43,056	41,454
Other income (expense):
Interest and debt expense		6,148	6,204	19,614	16,416
Other income (expense), net		17	16	(87)	51
Net income before income taxes		7,140	12,236	23,355	25,089
Provision for income taxes		(282)	(3)	(760)	(354)
Net income		6,858	12,233	22,595	24,735
Less net loss attributable to General Partner	[1]	(7,165)	(4,260)	(23,309)	(22,996)
Net income attributable to limited partners		$ 14,023	$ 16,493	$ 45,904	$ 47,731
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Distributions Declared, Per Unit		$ 0.4125	$ 0.3650	$ 1.2075	$ 1.0450
Fee Based Revenues [Member]
Revenues:
Revenues: Affiliate		$ 51,749	$ 58,111	$ 157,642	$ 151,054
Revenues: Third-party		814	787	2,181	2,089
Sales Based Revenues [Member]
Revenues:
Revenues: Affiliate		131,405	158,848	355,459	456,195
Revenues: Third-party		$ 385,293	$ 462,924	$ 1,100,620	$ 1,414,632
Common Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic		$ 0.23	$ 0.35	$ 0.83	$ 1.01
Earnings Per Share, Diluted		$ 0.23	$ 0.35	$ 0.83	$ 1.01
Weighted Average Number of Shares Outstanding, Basic		30,884	24,017	27,260	24,006
Weighted Average Number of Shares Outstanding, Diluted		30,901	24,024	27,274	24,024
Subordinated Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted		$ 0.25	$ 0.35	$ 0.89	$ 1.01
Weighted Average Number of Shares Outstanding, Basic and Diluted		22,811	22,811	22,811	22,811

[1] We apply the two-class method to calculate earnings per unit and allocate the results of operations of the St. Paul Park Logistics Assets prior to the St. Paul Park Logistics Transaction and the TexNew Mex Pipeline System prior to the TexNew Mex Pipeline Acquisition entirely to our general partner. The limited partners had no rights to the results of operations before these acquisitions.