Derivative Instruments (Schedule Of Natural Gas Derivative Positions) (Details) - Jun. 30, 2015 - Swaps [Member] - Natural Gas Derivative Positions [Member] - 2015 [Member]	MMBTU / d $ / MMBTU
Derivative [Line Items]
Volume (in MMBtu/d)	30,000
Weighted Average Floor Price ($/MMBtu) \| $ / MMBTU	4.29

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

No definition available.

Name:	us-gaap_DerivativeAverageFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant