Earnings Per Unit (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares bbl	Sep. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Oct. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 20,752	$ 6,858	$ 9,980	$ 5,757	$ 7,971	$ 12,233	$ 7,120	$ 5,382	$ 43,347	$ 32,706	$ 32,908
Less net loss attributable to General Partner									(23,309)	(29,867)	(20,084)
Net income attributable to limited partners	$ 20,752	$ 14,023	$ 17,874	$ 14,007	$ 14,842	$ 16,493	$ 15,915	$ 15,323	66,656	62,573	52,992
Incentive Distribution, Distribution									(4,447)	(1,085)	0
Net Income (Loss) Allocated to General Partners									(23,309)	(29,867)	(20,084)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									(22,426)	(5,821)	(444)
Distribution Made to Limited Partner, Cash Distributions Declared									(89,082)
Weighted Average Number of Shares Outstanding, Basic | shares	38,074,000	30,884,000	26,409,000	24,448,000	24,314,000	24,017,000	24,017,000	23,985,000
Weighted Average Number of Shares Outstanding, Diluted | shares	38,095,000	30,901,000	26,427,000	24,454,000	24,321,000	24,024,000	24,051,000	23,996,000
Weighted Average Number of Shares Outstanding, Basic and Diluted | shares	22,811,000	22,811,000	22,811,000	22,811,000	22,811,000	22,811,000	22,811,000	22,811,000
Earnings Per Share, Basic | $ / shares	$ 0.31	$ 0.23	$ 0.33	$ 0.28	$ 0.30	$ 0.35	$ 0.34	$ 0.33
Earnings Per Share, Diluted | $ / shares	0.31	0.23	0.33	0.28	0.30	0.35	0.34	0.33
Earnings Per Share, Basic and Diluted | $ / shares	$ 0.31	$ 0.25	$ 0.36	$ 0.28	$ 0.29	$ 0.35	$ 0.34	$ 0.33
TexNew Mex 16 inch pipeline [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Long-term Purchase Commitment, Minimum Volume Required | bbl					13,000
TexNew Mex 16 inch pipeline [Member] | Western Refining, Inc. [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Economic Rights, Crude Oil Throughput, Percent												80.00%
TexNew Mex Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared									0	(310)	0
Common Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									(12,736)	(2,990)	(223)
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									34,717	31,446	26,679
Distribution Made to Limited Partner, Cash Distributions Declared									$ (47,453)	$ (34,436)	$ (26,902)
Weighted Average Number of Shares Outstanding, Basic | shares									29,979,000	24,084,000	23,059,000
Weighted Average Number of Shares Outstanding, Diluted | shares									29,994,000	24,099,000	23,107,000
Earnings Per Share, Basic | $ / shares									$ 1.16	$ 1.31	$ 1.16
Earnings Per Share, Diluted | $ / shares									$ 1.16	$ 1.30	$ 1.15
Subordinated Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									$ (9,690)	$ (2,831)	$ (221)
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									27,492	29,732	26,313
Distribution Made to Limited Partner, Cash Distributions Declared									$ (37,182)	$ (32,563)	$ (26,534)
Weighted Average Number of Shares Outstanding, Basic and Diluted | shares									22,811,000	22,811,000	22,811,000
Earnings Per Share, Basic and Diluted | $ / shares									$ 1.21	$ 1.30	$ 1.15
Weighted Average Number Diluted Shares Outstanding Adjustment | shares									0
General Partner [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									$ (18,862)	$ (28,782)	$ (20,084)