Impairment (Policies)

9 Months Ended

Sep. 30, 2013

Property, Plant and Equipment [Abstract]

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

We test our long-lived assets, other than natural gas and oil properties, for recoverability whenever events or changes in circumstances indicate that carrying amounts may not be recoverable and recognize an impairment loss if the carrying amount of a long-lived asset is not recoverable and exceeds its fair value.