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Contingencies (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Enogex Federal Court Case [Member] | Dec. 31, 2013 Enogex State Court Case [Member]
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Damages Sought, Value |  |  | $ 75,000 | $ 105,000
Accrued environmental | $ 3,871 | $ 4,586 |  |
Number of years expected for future environmental remediation expenditures | 14 years |  |  |

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