Components of Working Capital - Other Current Assets Table (details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Other Current Assets [Line Items]
Natural gas liquids inventory	$ 2,438		$ 1,678
Natural gas imbalance receivables	2,729		1,663
Prepaid insurance	2,083		1,897
Other	1,662		1,760
Other current assets	$ 8,912	[1]	$ 6,998	[1],[2]

[1] Other current assets includes natural gas imbalance receivables from affiliates of $0.1 million and $0.4 million as of September 30, 2013, and December 31, 2012, respectively.

[2] Financial information has been recast to include the financial position and results attributable to the Non-Operated Marcellus Interest. See Note 2.