Components of Working Capital - Other Current Assets Table (details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Other Current Assets [Line Items]
Natural gas liquids inventory	$ 5,316		$ 2,584
Natural gas imbalance receivables	415		3,605
Prepaid insurance	3,217		2,900
Other	1,893		1,710
Total other current assets	$ 10,841	[1]	$ 10,799	[1]

[1] Other current assets includes natural gas imbalance receivables from affiliates of $0.2 million and $0.1 million as of December 31, 2014 and 2013, respectively.