Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidated Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Current assets:
Cash and cash equivalents	$ 5,237	$ 5,237	$ 6,369	[1]	$ 8,052	[1]	$ 9,511	[1]
Accounts receivable	38,720		38,052	[1]
Intercompany accounts receivable (payable)	0		0
Prepaid and other current assets	3,619		3,729	[1]
Total current assets	47,576		48,150	[1]
Properties and equipment, net	960,535		960,499	[1]
Investments in subsidiaries	0		0
Transportation agreements, net	94,596		101,543
Goodwill	256,498		256,498	[1]
Investment in SLC Pipeline	25,041		25,302	[1]
Other assets	9,864		7,204	[1]
Total assets	1,394,110		1,399,196	[1]
Current liabilities:
Accounts payable	12,030		24,849	[1]
Accrued interest	10,226		8,280	[1]
Deferred revenue	8,901		4,447	[1]
Accrued property taxes	2,688		2,196	[1]
Other current liabilities	1,905		1,777	[1]
Total current liabilities	35,750		41,549	[1]
Long-term debt	864,674		605,888	[1]
Other long-term liabilities	15,433		8,653
Deferred Revenue, Noncurrent	11,494		5,428
Class B unit	13,903		0	[1]
Equity - partners	352,653		638,676	[1]	(364,861)	[1]	353,402	[1]
Equity - noncontrolling interest	100,203		99,002	[1]
Total liabilities and partners’ equity	1,394,110		1,399,196	[1]
Parent [Member]
Current assets:
Cash and cash equivalents	2	2	2		2		2
Accounts receivable	0		0
Intercompany accounts receivable (payable)	42,194		17,745
Prepaid and other current assets	224		266
Total current assets	42,420		18,013
Properties and equipment, net	0		0
Investments in subsidiaries	777,472		960,516
Transportation agreements, net	0		0
Goodwill	0		0
Investment in SLC Pipeline	0		0
Other assets	1,154		1,322
Total assets	821,046		979,851
Current liabilities:
Accounts payable	0		0
Accrued interest	10,198		7,498
Deferred revenue	0		0
Accrued property taxes	0		0
Other current liabilities	563		689
Total current liabilities	10,761		8,187
Long-term debt	443,674		332,988
Other long-term liabilities	55		0
Deferred Revenue, Noncurrent	0		0
Class B unit	13,903
Equity - partners	352,653		638,676
Equity - noncontrolling interest	0		0
Total liabilities and partners’ equity	821,046		979,851
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	823	823	3,267		401		2,506
Accounts receivable	32,319		33,972
Intercompany accounts receivable (payable)	(42,194)		(17,745)
Prepaid and other current assets	2,395		2,378
Total current assets	(6,657)		21,872
Properties and equipment, net	563,701		559,212
Investments in subsidiaries	300,607		297,008
Transportation agreements, net	94,596		101,543
Goodwill	256,498		256,498
Investment in SLC Pipeline	25,041		25,302
Other assets	8,710		5,882
Total assets	1,242,496		1,267,317
Current liabilities:
Accounts payable	10,745		11,307
Accrued interest	28		782
Deferred revenue	3,319		4,447
Accrued property taxes	1,923		2,196
Other current liabilities	1,274		1,088
Total current liabilities	17,289		19,820
Long-term debt	421,000		272,900
Other long-term liabilities	15,241		8,653
Deferred Revenue, Noncurrent	11,494		5,428
Class B unit	0
Equity - partners	777,472		960,516
Equity - noncontrolling interest	0		0
Total liabilities and partners’ equity	1,242,496		1,267,317
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	4,412	4,412	3,100		7,649		7,003
Accounts receivable	6,401		4,080
Intercompany accounts receivable (payable)	0		0
Prepaid and other current assets	1,000		1,085
Total current assets	11,813		8,265
Properties and equipment, net	396,834		401,287
Investments in subsidiaries	0		0
Transportation agreements, net	0		0
Goodwill	0		0
Investment in SLC Pipeline	0		0
Other assets	0		0
Total assets	408,647		409,552
Current liabilities:
Accounts payable	1,285		13,542
Accrued interest	0		0
Deferred revenue	5,582		0
Accrued property taxes	765		0
Other current liabilities	68		0
Total current liabilities	7,700		13,542
Long-term debt	0		0
Other long-term liabilities	137		0
Deferred Revenue, Noncurrent	0		0
Class B unit	0
Equity - partners	400,810		396,010
Equity - noncontrolling interest	0		0
Total liabilities and partners’ equity	408,647		409,552
Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0	0		0		0
Accounts receivable	0		0
Intercompany accounts receivable (payable)	0		0
Prepaid and other current assets	0		0
Total current assets	0		0
Properties and equipment, net	0		0
Investments in subsidiaries	(1,078,079)		(1,257,524)
Transportation agreements, net	0		0
Goodwill	0		0
Investment in SLC Pipeline	0		0
Other assets	0		0
Total assets	(1,078,079)		(1,257,524)
Current liabilities:
Accounts payable	0		0
Accrued interest	0		0
Deferred revenue	0		0
Accrued property taxes	0		0
Other current liabilities	0		0
Total current liabilities	0		0
Long-term debt	0		0
Other long-term liabilities	0		0
Deferred Revenue, Noncurrent	0		0
Class B unit	0
Equity - partners	(1,178,282)		(1,356,526)
Equity - noncontrolling interest	100,203		99,002
Total liabilities and partners’ equity	$ (1,078,079)		$ (1,257,524)

[1] (1) Restated as described in Note 2.