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Commitments and Contingencies (Details) (West Gude Drive [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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West Gude Drive [Member] |
Loss Contingencies [Line Items] |
Letters of Credit Outstanding, Amount | $ 0.8

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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