Acquisition (Tables)

6 Months Ended

Jun. 30, 2012

Business Combinations [Abstract]

Schedule of Purchase Price Allocation

The preliminary allocation of the purchase price is summarized as follows:

Property and equipment	$	28,456
Equity investees	182,993
Asset retirement obligation assumed	(5,873		)
Total allocation	$	205,576

Schedule Of Selected Financial Information

	Three Months Ended June 30,		Six Months Ended June 30,
	2012
Revenues	$	1,332	$	3,154
Equity in earnings of equity investees	$	3,041	$	5,697
Net income	$	3,655	$	7,178

Schedule Of Pro Forma Financial Information

	Three Months Ended June 30,		Six Months Ended June 30,
	2011
Pro forma earnings data:
Revenues	$	764,546	$	1,456,100
Equity in earnings of equity investees	$	3,843	$	9,358
Net income	$	19,892	$	28,038
Basic and diluted earnings per unit:
As reported net income per unit	$	0.27	$	0.38
Pro forma net income per unit	$	0.31	$	0.43
As reported units outstanding	64,615		64,615
Pro forma units outstanding	64,615		64,615