CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 54,918		$ 56,962
Accounts receivable, net	126,909	[1]	119,193	[1]
Risk management assets	16,183		4,322
Prepayments and other current assets	5,555		5,114
Total current assets	203,565		185,591
Property, plant and equipment, net	1,372,509		1,103,699
Intangible assets, net	162,071		192,425
Investments in unconsolidated affiliates	431,447		544,687
Escrow cash	1,848		1,848
Risk management assets	1,881		6,452
Other assets, net	26,843		29,895
Total assets	2,200,164		2,064,597
Current liabilities:
Accounts payable	162,147	[1]	155,921	[1]
Accrued capital expenditures	11,306		7,033
Accrued interest	11,089		8,686
Accrued tax liability	1,551		1,182
Risk management liabilities			3,565
Other current liabilities	20,034		15,007
Total current liabilities	206,127		191,394
Long term debt (includes $3,124 and $0 bond premium as of December 31, 2012 and 2011, respectively)	1,001,649		994,525
Deferred tax liability	2,494		2,199
Risk management and other noncurrent liabilities	9,618		4,581
Commitments and contingencies (Note 11)
Members' capital:
Series A convertible preferred units, no par value, 12,897,029 units and 11,684,074 units issued and outstanding as of December 31, 2012 and 2011, respectively	285,168		285,168
Common units, no par value, 78,966,408 units and 66,341,458 units issued and outstanding as of December 31, 2012 and 2011, respectively	1,555,468		1,164,853
Paid in capital	72,916		62,277
Accumulated deficit	(935,482)		(624,121)
Accumulated other comprehensive income (loss)	2,206		(16,279)
Members' equity, total	980,276		871,898
Total liabilities and members' capital	$ 2,200,164		$ 2,064,597

[1] Inclusive of related party transactions discussed in Note 7