Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Affiliates	$ 167,626	$ 146,376	$ 101,395
Third parties	45,923	35,721	45,166
Total revenues	213,549	182,097	146,561
Operating costs and expenses:
Operations	62,202	52,947	44,003
Depreciation and amortization	33,150	30,682	26,714
General and administrative	6,576	7,719	7,586
Total operating costs and expenses	101,928	91,348	78,303
Operating income	111,621	90,749	68,258
Other income (expense):
Equity in earnings of SLC Pipeline	2,552	2,393	1,919
SLC Pipeline acquisition costs	0	0	(2,500)
Interest income	0	7	11
Interest expense	(35,959)	(34,001)	(21,501)
Other income	17	17	67
Other nonoperating income (expense), equity earnings and acquisition costs	(33,390)	(31,584)	(22,004)
Income from continuing operations before income taxes	78,231	59,165	46,254
State income tax	(234)	(296)	(20)
Income from continuing operations	77,997	58,869	46,234
Discontinued Operations
Income from discontinued operations, net of noncontrolling interest of $1,579	0	0	5,301
Gain on sale of interest in Rio Grande Pipeline Company	0	0	14,479
Income from discontinued operations	0	0	19,780
Net income	77,997	58,869	66,014
Less general partner interest in net income, including incentive distributions	16,769	12,152	7,947
Limited partners’ interest in net income	$ 61,228	$ 46,717	$ 58,067
Limited partners’ per unit interest in earnings – basic and diluted:
Income from continuing operations	$ 2.68	$ 2.12	$ 2.12
Income from discontinued operations	$ 0	$ 0	$ 0.28
Gain on sale of discontinued operations	$ 0	$ 0	$ 0.78
Net income	$ 2.68	$ 2.12	$ 3.18
Weighted average limited partners’ units outstanding	22,836	22,079	18,268