XML 25 R43.htm IDEA: XBRL DOCUMENT v2.3.0.15
Derivatives and Risk Management (Narratives) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Accumulated other comprehensive income, net gain related to hedging activities$ 242,500,000 
Deferred income tax liability, accumulated other comprehensive income155,000,000 
Cash flow hedge after-tax net gain to be transferred from accumulated other comprehensive income to earnings during the next twelve months186,300,000 
Derivative Instruments, Gain Reclassified from Accumulated Other Comprehensive Income into Earnings, Effective Portion$ 186,600,000$ 194,600,000
Fair value hedges

For fair value hedges, the gain or loss on the derivative instrument as well as the offsetting gain or loss on the hedged item are recognized in earnings immediately. As of September 30, 2011 and December 31, 2010, the Company had no material fair value hedges.

 
Year 2011 [Member]
  
Volume of Natural Gas Production (in Bcf), Basis Swaps Not Qualifying for Hedge Accounting Treatment9.2 
Year 2012 [Member]
  
Volume of Natural Gas Production (in Bcf), Basis Swaps Not Qualifying for Hedge Accounting Treatment37.7 
Year 2013 [Member]
  
Volume of Natural Gas Production (in Bcf), Basis Swaps Not Qualifying for Hedge Accounting Treatment30.1 
Year 2014 [Member]
  
Volume of Natural Gas Production (in Bcf), Basis Swaps Not Qualifying for Hedge Accounting Treatment9.1