Certain Relationships and Related Party Transactions (Narrative) (Details) - MGP and Affiliates	9 Months Ended
	Sep. 30, 2015 $ / mo
Administrative
Related Party Transaction [Line Items]
Monthly Administrative Costs Per Well	75
Supervision
Related Party Transaction [Line Items]
Monthly Supervision Fees Per Well	320
Transportation
Related Party Transaction [Line Items]
Transportation Fee Rate As Percentage Of Natural Gas Sales Price	13.00%