Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2013

Variable Interest Entities

Consolidated assets and liabilities attributable to VIEs reflected in the Partnership's Consolidated Balance Sheets

The following tables show the consolidated assets and liabilities attributable to MarkWest Pioneer and MarkWest Utica EMG, excluding intercompany balances, as of March 31, 2013 and December 31, 2012, respectively (in thousands):

	As of March 31, 2013
	MarkWest Pioneer		MarkWest Utica EMG		Total
ASSETS
Cash and cash equivalents	$	2,661	$	148,067	$	150,728
Restricted cash	—		500		500
Receivables, net	1,088		160		1,248
Other current assets	131		1,463		1,594
Property, plant and equipment, net of accumulated depreciation of $23,429 and $7,241, respectively	134,429		723,303		857,732
Other long-term assets	102		—		102
Total assets	$	138,411	$	873,493	$	1,011,904
LIABILITIES
Accounts payable	$	14	$	81,978	$	81,992
Accrued liabilities	1,117		135,677		136,794
Other long-term liabilities	80		—		80
Total liabilities	$	1,211	$	217,655	$	218,866

	As of December 31, 2012
	MarkWest Pioneer		MarkWest Utica EMG		Total
ASSETS
Cash and cash equivalents	$	2,143	$	31,584	$	33,727
Restricted cash	—		500		500
Receivables, net	1,188		403		1,591
Other current assets	182		82		264
Property, plant and equipment, net of accumulated depreciation of $21,849 and $2,787, respectively	136,009		407,418		543,427
Other long-term assets	102		—		102
Total assets	$	139,624	$	439,987	$	579,611
LIABILITIES
Accounts payable	$	18	$	73,865	$	73,883
Accrued liabilities	1,174		109,572		110,746
Other long-term liabilities	79		—		79
Total liabilities	$	1,271	$	183,437	$	184,708