Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Revenues:
Total revenues	$ 627,509	$ 578,602		$ 1,232,201	$ 1,046,641
Cost of products sold:
Affiliate	137,150	123,870		259,849	219,019
Third-party	403,180	380,386		797,780	680,827
Operating and maintenance expenses	47,269	42,991		92,116	87,649
Selling, general and administrative expenses	8,023	6,007		14,766	11,371
Gain on disposal of assets, net	(2,936)	(802)		(3,227)	(901)
Depreciation and amortization	9,784	9,553		19,516	18,891
Total operating costs and expenses	602,470	562,005		1,180,800	1,016,856
Operating income	25,039	16,597		51,401	29,785
Other income (expense):
Interest and debt expense	6,576	6,414		13,184	13,466
Other income (expense), net	15	14		37	(104)
Net income before income taxes	18,478	10,197		38,254	16,215
Benefit (provision) for income taxes	250	(217)		360	(478)
Net income	18,728	9,980		38,614	15,737
Less net loss attributable to General Partner	0	(7,894)	[1]	0	(16,144)	[1]
Net income attributable to limited partners	$ 18,728	$ 17,874		$ 38,614	$ 31,881
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.4525	$ 0.4025		$ 0.8900	$ 0.7950
Fee Based Revenues [Member]
Revenues:
Revenues: Affiliate	$ 67,783	$ 53,965		$ 133,260	$ 105,893
Revenues: Third-party	703	677		1,322	1,367
Sales Based Revenues [Member]
Revenues:
Revenues: Affiliate	139,770	126,525		264,837	224,054
Revenues: Third-party	419,253	397,435		832,782	715,327
Common Units [Member]
Other income (expense):
Net income attributable to limited partners	$ 14,747	$ 8,739		$ 27,725	$ 15,558
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.24	$ 0.33		$ 0.52	$ 0.61
Earnings Per Share, Diluted	$ 0.24	$ 0.33		$ 0.52	$ 0.61
Weighted Average Number of Shares Outstanding, Basic	60,962	26,409		53,364	25,429
Weighted Average Number of Shares Outstanding, Diluted	60,971	26,427		53,372	25,441
Subordinated Units [Member]
Other income (expense):
Net income attributable to limited partners	$ 0	$ 8,214		$ 3,845	$ 14,641
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted	$ 0.00	$ 0.36		$ 0.51	$ 0.64
Weighted Average Number of Shares Outstanding, Basic and Diluted	0	22,811		7,562	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 entirely to our general partner. The limited partners had no rights to the results of operations before the acquisition.