Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 67,461,000	$ 73,613,000
Restricted cash	34,912,000	39,543,000
Accounts receivable (net of allowance of $4,416 and $3,623 at September 30, 2012 and December 31, 2011, respectively)	335,795,000	209,781,000
Receivable from affiliates	5,786,000	6,408,000
Inventories	34,479,000	31,994,000
Other current assets	17,998,000	28,396,000
Total current assets	496,431,000	389,735,000
Property, plant and equipment (net of accumulated depreciation of $119,547 and $83,481 at September 30, 2012 and December 31, 2011, respectively)	800,231,000	733,925,000
Equity method investments	378,522,000	327,243,000
Goodwill	9,956,000	9,453,000
Other intangible assets (net of accumulated amortization of $6,272 and $4,336 at September 30, 2012 and December 31, 2011, respectively)	8,181,000	8,950,000
Other assets, net	17,744,000	21,875,000
Total assets	1,711,065,000	1,491,181,000
Current liabilities:
Accounts payable	237,357,000	145,203,000
Payable to affiliates	1,577,000	6,314,000
Accrued liabilities	73,943,000	53,675,000
Payables to pre-petition creditors	32,944,000	37,800,000
Deferred revenue	15,127,000	23,031,000
Other current liabilities	3,495,000	4,430,000
Current portion of long-term debt	2,096,000	26,058,000
Total current liabilities	366,539,000	296,511,000
Long-term debt	189,569,000	83,277,000
Deferred income taxes	76,581,000	73,784,000
Other noncurrent liabilities	77,024,000	58,944,000
SemGroup owners' equity:
Common stock (Note 10)	419,497	418,000
Additional paid-in capital	1,036,978,000	1,032,365,000
Treasury stock, at cost (Note 10)	(242,000)	0
Accumulated deficit	(166,768,000)	(167,812,000)
Accumulated other comprehensive income (loss)	1,055,000	(13,875,000)
Total SemGroup owners' equity	871,442,000	851,096,000
Noncontrolling interests in consolidated subsidiaries	129,910,000	127,569,000
Total owners' equity	1,001,352,000	978,665,000
Total liabilities and owners' equity	$ 1,711,065,000	$ 1,491,181,000