Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Derivative Instruments And Hedging Activities (Outstanding Commodity Forward Contracts To Hedge Forecasted Transactions) (Details) (Natural Gas (MMBtu) [Member])	Dec. 31, 2011	Dec. 31, 2010
Natural Gas (MMBtu) [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount		1,840,000