XML 45 R89.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Property, Plant and Equipment (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Oil and gas proved properties |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest | $ 11.7 | $ 1.6
Non-oil and natural gas equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest | $ 11.4 | $ 6.7

X
- Definition Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis. + References No definition available. + Details
Name: | us-gaap_AccumulatedCapitalizedInterestCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration