Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Revenues:
Total revenues		$ 468,039	$ 607,396
Cost of products sold:
Affiliate		95,149	130,508
Third-party		300,441	411,193
Operating and maintenance expenses		38,901	36,371
Selling, general and administrative expenses		5,065	5,955
Gain on disposal of assets, net		(99)	(84)
Depreciation and amortization		7,144	5,892
Total operating costs and expenses		446,601	589,835
Operating income		21,438	17,561
Other income (expense):
Interest and debt expense		7,052	3,964
Other income, net		(118)	17
Net income before income taxes		14,268	13,614
Provision for income taxes		(261)	(203)
Net income		14,007	13,411
Less net loss attributable to General Partner	[1]	0	(1,912)
Net income attributable to limited partners		$ 14,007	$ 15,323
Earnings Per Share [Abstract]
Distribution Made to Limited Partner, Distributions Declared, Per Unit		$ 0.3925	$ 0.3325
Common Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic		0.28	0.33
Earnings Per Share, Diluted		$ 0.28	$ 0.33
Weighted Average Number of Shares Outstanding, Basic		24,448	23,985
Weighted Average Number of Shares Outstanding, Diluted		24,454	23,996
Subordinated Units [Member]
Earnings Per Share [Abstract]
Earnings Per Share, Basic and Diluted		$ 0.28	$ 0.33
Weighted Average Number of Shares Outstanding, Basic and Diluted		22,811	22,811
Fee Based Revenues [Member]
Revenues:
Revenues: Affiliate		$ 51,928	$ 45,478
Revenues: Third-party		690	623
Sales Based Revenues [Member]
Revenues:
Revenues: Affiliate		97,529	132,771
Revenues: Third-party		$ 317,892	$ 428,524

[1] We apply the two-class method to calculate earnings per unit and allocate the results of operations of 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 this acquisition.