Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidated Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,667	$ 6,352	$ 11,220	$ 5,237
Accounts receivable	35,972	34,736
Intercompany accounts receivable	0	0
Prepaid and other current assets	4,419	3,874
Total current assets	42,058	44,962
Properties and equipment, net	971,560	957,814
Investments in subsidiaries	0	0
Transportation agreements, net	82,440	87,650
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,579	24,741
Other assets	9,034	10,843
Total assets	1,386,169	1,382,508
Current liabilities:
Accounts payable	15,085	22,898
Intercompany Accounts Payable	0	0
Accrued interest	1,823	10,239
Deferred revenue	14,271	13,981
Accrued property taxes	6,469	2,603
Other current liabilities	2,862	1,845
Total current liabilities	40,510	51,566
Long-term debt	851,416	807,630
Other long-term liabilities	13,374	14,585
Deferred revenue	26,432	21,669
Class B unit	25,082	20,124
Equity - partners	333,513	369,446
Equity - noncontrolling interest	95,842	97,488
Total liabilities and equity	1,386,169	1,382,508
Parent Company [Member]
Current assets:
Cash and cash equivalents	2	2	2	2
Accounts receivable	0	0
Intercompany accounts receivable	0	0
Prepaid and other current assets	342	234
Total current assets	344	236
Properties and equipment, net	0	0
Investments in subsidiaries	990,270	885,598
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	1,335	1,684
Total assets	991,949	887,518
Current liabilities:
Accounts payable	0	0
Intercompany Accounts Payable	360,189	62,516
Accrued interest	1,625	10,198
Deferred revenue	0	0
Accrued property taxes	0	0
Other current liabilities	73	629
Total current liabilities	361,887	73,343
Long-term debt	296,416	444,630
Other long-term liabilities	133	99
Deferred revenue	0	0
Class B unit	0	0
Equity - partners	333,513	369,446
Equity - noncontrolling interest	0	0
Total liabilities and equity	991,949	887,518
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	18	1,447	6,331	823
Accounts receivable	30,971	31,107
Intercompany accounts receivable	360,189	62,516
Prepaid and other current assets	2,786	2,590
Total current assets	393,964	97,660
Properties and equipment, net	586,175	564,847
Investments in subsidiaries	287,524	292,464
Transportation agreements, net	82,440	87,650
Goodwill	256,498	256,498
Investment in SLC Pipeline	24,579	24,741
Other assets	7,699	9,159
Total assets	1,638,879	1,333,019
Current liabilities:
Accounts payable	14,418	18,966
Intercompany Accounts Payable	0	0
Accrued interest	198	41
Deferred revenue	8,820	6,406
Accrued property taxes	2,786	1,661
Other current liabilities	2,788	1,216
Total current liabilities	29,010	28,290
Long-term debt	555,000	363,000
Other long-term liabilities	13,085	14,338
Deferred revenue	26,432	21,669
Class B unit	25,082	20,124
Equity - partners	990,270	885,598
Equity - noncontrolling interest	0	0
Total liabilities and equity	1,638,879	1,333,019
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	1,647	4,903	4,887	4,412
Accounts receivable	5,231	4,543
Intercompany accounts receivable	0	0
Prepaid and other current assets	1,291	1,050
Total current assets	8,169	10,496
Properties and equipment, net	385,385	392,967
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	393,554	403,463
Current liabilities:
Accounts payable	897	4,846
Intercompany Accounts Payable	0	0
Accrued interest	0	0
Deferred revenue	5,451	7,575
Accrued property taxes	3,683	942
Other current liabilities	1	0
Total current liabilities	10,032	13,363
Long-term debt	0	0
Other long-term liabilities	156	148
Deferred revenue	0	0
Class B unit	0	0
Equity - partners	383,366	389,952
Equity - noncontrolling interest	0	0
Total liabilities and equity	393,554	403,463
Eliminations [Member]
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable	(230)	(914)
Intercompany accounts receivable	(360,189)	(62,516)
Prepaid and other current assets	0	0
Total current assets	(360,419)	(63,430)
Properties and equipment, net	0	0
Investments in subsidiaries	(1,277,794)	(1,178,062)
Transportation agreements, net	0	0
Goodwill	0	0
Investment in SLC Pipeline	0	0
Other assets	0	0
Total assets	(1,638,213)	(1,241,492)
Current liabilities:
Accounts payable	(230)	(914)
Intercompany Accounts Payable	(360,189)	(62,516)
Accrued interest	0	0
Deferred revenue	0	0
Accrued property taxes	0	0
Other current liabilities	0	0
Total current liabilities	(360,419)	(63,430)
Long-term debt	0	0
Other long-term liabilities	0	0
Deferred revenue	0	0
Class B unit	0	0
Equity - partners	(1,373,636)	(1,275,550)
Equity - noncontrolling interest	95,842	97,488
Total liabilities and equity	$ (1,638,213)	$ (1,241,492)