Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 77,352	$ 80,029
Restricted cash	34,624	34,678
Accounts receivable (net of allowance of $4,184 and $3,687 at March 31, 2013 and December 31, 2012, respectively)	351,361	346,169
Receivable from affiliates	5,108	6,178
Inventories	37,820	34,433
Other current assets	13,392	18,516
Total current assets	519,657	520,003
Property, plant and equipment (net of accumulated depreciation of $141,123 and $130,886 at March 31, 2013 and December 31, 2012, respectively)	817,141	814,724
Equity method investments	423,507	387,802
Goodwill	10,227	9,884
Other intangible assets (net of accumulated amortization of $7,534 and $6,701 at March 31, 2013 and December 31, 2012, respectively)	7,707	7,585
Other noncurrent assets, net	30,969	8,181
Total assets	1,809,208	1,748,179
Current liabilities:
Accounts payable	256,385	253,623
Accrued liabilities	65,026	63,831
Payables to pre-petition creditors	32,917	32,933
Deferred revenue	15,731	18,973
Other current liabilities	5,656	4,960
Current portion of long-term debt	4,567	24
Total current liabilities	380,282	374,344
Long-term debt	176,056	206,062
Deferred income taxes	59,987	65,620
Other noncurrent liabilities	106,489	80,625
Commitments and contingencies (Note 9)
SemGroup owners' equity:
Common stock (Note 10)	421	420
Additional paid-in capital	1,097,028	1,039,189
Treasury stock, at cost (Note 10)	(613)	(242)
Accumulated deficit	(102,251)	(145,674)
Accumulated other comprehensive loss	(6,357)	(1,299)
Total SemGroup owners' equity	988,228	892,394
Noncontrolling interests in consolidated subsidiaries	98,166	129,134
Total owners' equity	1,086,394	1,021,528
Total liabilities and owners' equity	$ 1,809,208	$ 1,748,179